From: Paul Eggert <eggert@cs.ucla.edu>
To: libc-alpha@sourceware.org
Subject: [PATCH] regex: fix buffer read overrun in search [BZ#28470]
Date: Mon, 18 Oct 2021 15:15:48 -0700 [thread overview]
Message-ID: <20211018221548.76024-1-eggert@cs.ucla.edu> (raw)
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.
---
posix/regexec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/posix/regexec.c b/posix/regexec.c
index 83e9aaf8ca..a955aa2182 100644
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -760,7 +760,7 @@ re_search_internal (const regex_t *preg, const char *string, Idx length,
}
/* 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
+ ch = (mctx.input.valid_len <= offset
? 0 : re_string_byte_at (&mctx.input, offset));
if (fastmap[ch])
break;
--
2.31.1
next reply other threads:[~2021-10-18 22:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-18 22:15 Paul Eggert [this message]
2021-10-19 7:17 ` Andreas Schwab
2021-10-19 8:13 ` Paul Eggert
2021-10-19 8:25 ` Andreas Schwab
2021-10-19 8:57 ` Paul Eggert
2021-10-19 15:09 ` Andreas Schwab
2021-10-19 18:14 ` Paul Eggert
2021-11-24 22:27 ` Paul Eggert
2021-11-24 22:45 ` Andreas Schwab
2021-11-24 23:50 ` Paul Eggert
2021-11-25 9:01 ` Andreas Schwab
2021-11-26 18:35 ` Paul Eggert
2021-11-26 18:39 ` Andreas Schwab
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