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regex: fix buffer read overrun in search [BZ#28470]

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Problem reported by Benno Schulenberg in:
https://lists.gnu.org/r/bug-gnulib/2021-10/msg00035.html
* posix/regexec.c (re_search_internal): Use better bounds check.
This commit is contained in:
Paul Eggert 2021-11-24 14:16:09 -08:00
parent c58d3b7d00
commit c52ef24829
1 changed files with 3 additions and 4 deletions
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7
posix/regexec.c
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@ -758,10 +758,9 @@ re_search_internal (const regex_t *preg, const char *string, Idx length,
offset = match_first - mctx.input.raw_mbs_idx;
}
/* If MATCH_FIRST is out of the buffer, leave it as '\0'.
Note that MATCH_FIRST must not be smaller than 0. */
ch = (match_first >= length
? 0 : re_string_byte_at (&mctx.input, offset));
/* Use buffer byte if OFFSET is in buffer, otherwise '\0'. */
ch = (offset < mctx.input.valid_len
? re_string_byte_at (&mctx.input, offset) : 0);
if (fastmap[ch])
break;
match_first += incr;