From: Jim Meyering <jim@meyering.net>
To: linux-btrfs@vger.kernel.org
Subject: [PATCH 4/4] mkfs: avoid heap-buffer-read-underrun for zero-length "size" arg
Date: Fri, 20 Apr 2012 19:36:48 +0200 [thread overview]
Message-ID: <1334943408-6720-5-git-send-email-jim@meyering.net> (raw)
In-Reply-To: <1334943408-6720-1-git-send-email-jim@meyering.net>
From: Jim Meyering <meyering@redhat.com>
* mkfs.c (parse_size): ./mkfs.btrfs -A '' would read and possibly
write the byte before beginning of strdup'd heap buffer. All other
size-accepting options were similarly affected.
---
mkfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mkfs.c b/mkfs.c
index 03239fb..4aff2fd 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -63,7 +63,7 @@ static u64 parse_size(char *s)
s = strdup(s);
- if (!isdigit(s[len - 1])) {
+ if (len && !isdigit(s[len - 1])) {
c = tolower(s[len - 1]);
switch (c) {
case 'g':
--
1.7.10.208.gb4267
next prev parent reply other threads:[~2012-04-20 17:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-20 17:36 btrfs-utils: minor buffer-overrun fixes Jim Meyering
2012-04-20 17:36 ` [PATCH 1/4] mkfs: use strdup in place of strlen,malloc,strcpy sequence Jim Meyering
2012-04-20 18:36 ` Josef Bacik
2012-04-20 17:36 ` [PATCH 2/4] restore: don't corrupt stack for a zero-length command-line argument Jim Meyering
2012-04-20 18:37 ` Josef Bacik
2012-04-20 18:40 ` Josef Bacik
2012-04-20 17:36 ` [PATCH 3/4] avoid strncpy-induced buffer overrun Jim Meyering
2012-04-20 18:42 ` Josef Bacik
2012-04-20 19:26 ` Jim Meyering
2012-04-20 17:36 ` Jim Meyering [this message]
2012-04-20 18:41 ` [PATCH 4/4] mkfs: avoid heap-buffer-read-underrun for zero-length "size" arg Josef Bacik
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1334943408-6720-5-git-send-email-jim@meyering.net \
--to=jim@meyering.net \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).