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commit 27572ef96a66b61f5a6d81196c05983ab3dc9994
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Sun Jun 30 20:45:19 2013 +0530
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Check for integer overflow
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diff --git glibc-2.17-c758a686/string/strcoll_l.c glibc-2.17-c758a686/string/strcoll_l.c
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index 1be6874..cbe5962 100644
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--- glibc-2.17-c758a686/string/strcoll_l.c
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+++ glibc-2.17-c758a686/string/strcoll_l.c
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@@ -524,6 +524,14 @@ STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l)
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memset (&seq1, 0, sizeof (seq1));
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seq2 = seq1;
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+ size_t size_max = SIZE_MAX / (sizeof (int32_t) + 1);
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+
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+ /* If the strings are long enough to cause overflow in the size request, then
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+ skip the allocation and proceed with the non-cached routines. */
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+ if (MIN (s1len, s2len) > size_max
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+ || MAX (s1len, s2len) > size_max - MIN (s1len, s2len))
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+ goto begin_collate;
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+
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if (! __libc_use_alloca ((s1len + s2len) * (sizeof (int32_t) + 1)))
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{
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seq1.idxarr = (int32_t *) malloc ((s1len + s2len) * (sizeof (int32_t) + 1));
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@@ -546,8 +554,10 @@ STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l)
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seq2.rulearr = (unsigned char *) alloca (s2len);
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}
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- int rule = 0;
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+ int rule;
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+ begin_collate:
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+ rule = 0;
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/* Cache values in the first pass and if needed, use them in subsequent
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passes. */
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for (int pass = 0; pass < nrules; ++pass)
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