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authorXi Wang <xi.wang@gmail.com>2013-02-27 17:05:21 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:21 -0800
commitdf1778be1a33edffa51d094eeda87c858ded6560 (patch)
treeb293cff5791db36641d4c3e802d0c16c77bfe362 /kernel/sysctl_binary.c
parentac2e5327a5e4f6477afc6a3b3b0dc6e0476d71d4 (diff)
downloadlinux-sh-df1778be1a33edffa51d094eeda87c858ded6560.tar.gz
sysctl: fix null checking in bin_dn_node_address()
The null check of `strchr() + 1' is broken, which is always non-null, leading to OOB read. Instead, check the result of strchr(). Signed-off-by: Xi Wang <xi.wang@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl_binary.c')
-rw-r--r--kernel/sysctl_binary.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index b25115e8c7f3..ebf72358e86a 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -1171,9 +1171,10 @@ static ssize_t bin_dn_node_address(struct file *file,
/* Convert the decnet address to binary */
result = -EIO;
- nodep = strchr(buf, '.') + 1;
+ nodep = strchr(buf, '.');
if (!nodep)
goto out;
+ ++nodep;
area = simple_strtoul(buf, NULL, 10);
node = simple_strtoul(nodep, NULL, 10);