void-packages/srcpkgs/glibc/patches/glibc-upstream-08.patch
2019-03-31 14:33:43 -03:00

50 lines
1.6 KiB
Diff

From 4d0b1b0f61bfba034e9e76a1d76acc59c975238f Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 21 Jan 2019 11:08:13 -0800
Subject: [PATCH 08] 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.
(cherry picked from commit 583dd860d5b833037175247230a328f0050dbfe9)
---
ChangeLog | 8 ++++++++
posix/regexec.c | 6 ++++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 90558e434c..fb88626efe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2019-01-31 Paul Eggert <eggert@cs.ucla.edu>
+
+ 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.
+
2019-03-13 Stefan Liebler <stli@linux.ibm.com>
* elf/dl-sysdep.c (_dl_show_auxv): Remove condition and always
diff --git a/posix/regexec.c b/posix/regexec.c
index 91d5a797b8..084b1222d9 100644
--- 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;
}
}