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| author |   Assaf Gordon <assafgordon@gmail.com> | 2018-09-05 23:25:07 -0700 |
|---|---|---|
| committer |   Paul Eggert <eggert@cs.ucla.edu> | 2018-12-16 07:08:29 -0800 |
| commit | 077caf61d867d4cab49b5aa42da1611868596fe7 (patch) | |
| tree | 870ea6314a4cb90d4db2b91eca8f100c6cf6b688 /posix/regexec.c | |
| parent | support: Do not require overflow builtin in support/blob_repeat.c (diff) | |
| download | glibc-077caf61d867d4cab49b5aa42da1611868596fe7.tar.gz glibc-077caf61d867d4cab49b5aa42da1611868596fe7.tar.bz2 glibc-077caf61d867d4cab49b5aa42da1611868596fe7.zip | |
regex: fix heap-use-after-free error
[BZ #18040]
Problem reported by Saito Takaaki <tails.saito@gmail.com> in
https://debbugs.gnu.org/32592
Call stack get_subexp->get_subexp_sub->clean_state_log_if_needed may
call extend_buffers which reallocates the re_string_t internal buffer.
Local variable 'buf' was not updated in such case, resulting in
use-after-free.
* posix/regexec.c (get_subexp): Update 'buf' after call to
get_subexp_sub.
Diffstat (limited to 'posix/regexec.c')
| -rw-r--r-- | posix/regexec.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/posix/regexec.c b/posix/regexec.c index c3e6a5b8cb..a29e8ad1ff 100644 --- a/posix/regexec.c +++ b/posix/regexec.c @@ -2783,6 +2783,7 @@ get_subexp (re_match_context_t *mctx, Idx bkref_node, Idx bkref_str_idx) return REG_ESPACE; err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node, bkref_str_idx); + buf = (const char *) re_string_get_buffer (&mctx->input); if (err == REG_NOMATCH) continue; } |