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100 lines
34 KiB

From 23ee7ce40943d063f1a15d672ae893e9bf1b0924 Mon Sep 17 00:00:00 2001
From: David Kilzer <ddkilzer@apple.com>
Date: Fri, 12 Feb 2016 09:58:29 -0800
Subject: [PATCH] Bug 758588: Heap-based buffer overread in
xmlParserPrintFileContextInternal
<https://bugzilla.gnome.org/show_bug.cgi?id=758588>
To: libvir-list@redhat.com
* parser.c:
(xmlParseEndTag2): Add bounds checks before dereferencing
ctxt->input->cur past the end of the buffer, or incrementing the
pointer past the end of the buffer.
* result/errors/758588.xml: Add test result.
* result/errors/758588.xml.err: Ditto.
* result/errors/758588.xml.str: Ditto.
* test/errors/758588.xml: Add regression test.
Signed-off-by: Daniel Veillard <veillard@redhat.com>
---
parser.c | 8 ++++++--
result/errors/758588.xml | 0
result/errors/758588.xml.err | 9 +++++++++
result/errors/758588.xml.str | 10 ++++++++++
test/errors/758588.xml | 1 +
5 files changed, 26 insertions(+), 2 deletions(-)
create mode 100644 result/errors/758588.xml
create mode 100644 result/errors/758588.xml.err
create mode 100644 result/errors/758588.xml.str
create mode 100644 test/errors/758588.xml
diff --git a/parser.c b/parser.c
index b1215ca..03bc4f8 100644
--- a/parser.c
+++ b/parser.c
@@ -9758,6 +9758,7 @@ static void
xmlParseEndTag2(xmlParserCtxtPtr ctxt, const xmlChar *prefix,
const xmlChar *URI, int line, int nsNr, int tlen) {
const xmlChar *name;
+ size_t curLength;
GROW;
if ((RAW != '<') || (NXT(1) != '/')) {
@@ -9766,8 +9767,11 @@ xmlParseEndTag2(xmlParserCtxtPtr ctxt, const xmlChar *prefix,
}
SKIP(2);
- if ((tlen > 0) && (xmlStrncmp(ctxt->input->cur, ctxt->name, tlen) == 0)) {
- if (ctxt->input->cur[tlen] == '>') {
+ curLength = ctxt->input->end - ctxt->input->cur;
+ if ((tlen > 0) && (curLength >= (size_t)tlen) &&
+ (xmlStrncmp(ctxt->input->cur, ctxt->name, tlen) == 0)) {
+ if ((curLength >= (size_t)(tlen + 1)) &&
+ (ctxt->input->cur[tlen] == '>')) {
ctxt->input->cur += tlen + 1;
goto done;
}
diff --git a/result/errors/758588.xml.err b/result/errors/758588.xml.err
new file mode 100644
index 0000000..dfa59bc
--- /dev/null
+++ b/result/errors/758588.xml.err
@@ -0,0 +1,9 @@
+./test/errors/758588.xml:1: namespace error : Namespace prefix a-340282366920938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686
+63472597946867209384634725979468672093846347259794686720938463472597946867261d:a
+ ^
+./test/errors/758588.xml:1: parser error : expected '>'
+2597946867209384634725979468672093846347259794686720938463472597946867261d:a></a
+ ^
+./test/errors/758588.xml:1: parser error : Opening and ending tag mismatch: a line 1 and a
+2597946867209384634725979468672093846347259794686720938463472597946867261d:a></a
+ ^
diff --git a/result/errors/758588.xml.str b/result/errors/758588.xml.str
new file mode 100644
index 0000000..303ee0c
--- /dev/null
+++ b/result/errors/758588.xml.str
@@ -0,0 +1,10 @@
+./test/errors/758588.xml:1: namespace error : Namespace prefix a-340282366920938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686
+63472597946867209384634725979468672093846347259794686720938463472597946867261d:a
+ ^
+./test/errors/758588.xml:1: parser error : expected '>'
+2597946867209384634725979468672093846347259794686720938463472597946867261d:a></a
+ ^
+./test/errors/758588.xml:1: parser error : Opening and ending tag mismatch: a line 1 and a
+2597946867209384634725979468672093846347259794686720938463472597946867261d:a></a
+ ^
+./test/errors/758588.xml : failed to parse
diff --git a/test/errors/758588.xml b/test/errors/758588.xml
new file mode 100644
index 0000000..bec7e93
--- /dev/null
+++ b/test/errors/758588.xml
@@ -0,0 +1 @@
+<a-34028236692093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672093846347259794686720938463472597946867209384634725979468672
\ No newline at end of file
--
2.5.5