Return -EINVAL rather than 0 given an invalid "mode" parameter.
Signed-off-by: Xi Wang <xi.w...@gmail.com>
---
Another way to check "mode" is as in inet_shutdown():
mode++;
if ((mode & ~SHUTDOWN_MASK) || !mode)
return -EINVAL;
This patch uses a simpler form, to check if "mode" is in the range
SHUT_RD ... SHUT_RDWR.
---
net/unix/af_unix.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c5ee4ff..8a84ab6 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2060,10 +2060,14 @@ static int unix_shutdown(struct socket *sock, int mode)
struct sock *sk = sock->sk;
struct sock *other;
- mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN);
-
- if (!mode)
- return 0;
+ if (mode < SHUT_RD || mode > SHUT_RDWR)
+ return -EINVAL;
+ /* This maps:
+ * SHUT_RD (0) -> RCV_SHUTDOWN (1)
+ * SHUT_WR (1) -> SEND_SHUTDOWN (2)
+ * SHUT_RDWR (2) -> SHUTDOWN_MASK (3)
+ */
+ ++mode;
unix_state_lock(sk);
sk->sk_shutdown |= mode;
--
1.7.9.5
--
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