Commit df1778be authored by Xi Wang's avatar Xi Wang Committed by Linus Torvalds
Browse files

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: default avatarXi Wang <xi.wang@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ac2e5327
......@@ -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);
......
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