a50c2190d3
Problem found by AddressSanitizer[1]:
Latest `grep` (git commit 1019e6e) compiled with asan may cause a
heap-buffer-overflow when `-i` is specified.
./grep -i '\(\(\)*.\)*\(\)\(\)\1' /bin/chvt
=================================================================
==16206==ERROR: AddressSanitizer: heap-buffer-overflow on address
1. https://debbugs.gnu.org/34140
Ref: https://sourceware.org/bugzilla/show_bug.cgi?id=24114
Signed-off-by: Alin Nastac <alin.nastac@gmail.com>
[commit title and description facelift]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
27 lines
868 B
Diff
27 lines
868 B
Diff
commit 583dd860d5b833037175247230a328f0050dbfe9
|
|
Author: Paul Eggert <eggert@cs.ucla.edu>
|
|
Date: Mon Jan 21 11:08:13 2019 -0800
|
|
|
|
regex: fix read overrun [BZ #24114]
|
|
|
|
Problem found by AddressSanitizer, reported by Hongxu Chen in:
|
|
https://debbugs.gnu.org/34140
|
|
* posix/regexec.c (proceed_next_node):
|
|
Do not read past end of input buffer.
|
|
|
|
--- a/posix/regexec.c
|
|
+++ b/posix/regexec.c
|
|
@@ -1293,8 +1293,10 @@ proceed_next_node (const re_match_context_t *mctx, Idx nregs, regmatch_t *regs,
|
|
else if (naccepted)
|
|
{
|
|
char *buf = (char *) re_string_get_buffer (&mctx->input);
|
|
- if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
|
|
- naccepted) != 0)
|
|
+ if (mctx->input.valid_len - *pidx < naccepted
|
|
+ || (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
|
|
+ naccepted)
|
|
+ != 0))
|
|
return -1;
|
|
}
|
|
}
|