3.5.7.8 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Xi Wang <xi.w...@gmail.com>
commit df1778be1a33edffa51d094eeda87c858ded6560 upstream.
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.w...@gmail.com>
Cc: "Eric W. Biederman" <ebied...@xmission.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
kernel/sysctl_binary.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index a650694..9f9aa32 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -1194,9 +1194,10 @@ 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);
--
1.8.1.2
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