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31 lines
1.2 KiB
31 lines
1.2 KiB
1 year ago
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commit fa5044f1e38f4f6515253449b6ca77fd14f53b8e
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Author: Paul Eggert <eggert@cs.ucla.edu>
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Date: Wed Nov 24 14:16:09 2021 -0800
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regex: fix buffer read overrun in search [BZ#28470]
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Problem reported by Benno Schulenberg in:
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https://lists.gnu.org/r/bug-gnulib/2021-10/msg00035.html
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* posix/regexec.c (re_search_internal): Use better bounds check.
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(cherry picked from commit c52ef24829f95a819965214eeae28e3289a91a61)
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diff --git a/posix/regexec.c b/posix/regexec.c
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index 83e9aaf8cad956a2..6aeba3c0b4da23cc 100644
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--- a/posix/regexec.c
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+++ b/posix/regexec.c
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@@ -758,10 +758,9 @@ re_search_internal (const regex_t *preg, const char *string, Idx length,
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offset = match_first - mctx.input.raw_mbs_idx;
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}
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- /* If MATCH_FIRST is out of the buffer, leave it as '\0'.
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- Note that MATCH_FIRST must not be smaller than 0. */
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- ch = (match_first >= length
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- ? 0 : re_string_byte_at (&mctx.input, offset));
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+ /* Use buffer byte if OFFSET is in buffer, otherwise '\0'. */
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+ ch = (offset < mctx.input.valid_len
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+ ? re_string_byte_at (&mctx.input, offset) : 0);
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if (fastmap[ch])
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break;
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match_first += incr;
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