linux-kernel - [PATCH] unix_diag: fix incorrect sign extension in unix_lookup_by

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Date:	Fri, 19 Feb 2016 04:27:48 +0300
From:	"Dmitry V. Levin" <ldv@...linux.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Pavel Emelyanov <xemul@...allels.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] unix_diag: fix incorrect sign extension in unix_lookup_by_ino

The value passed by unix_diag_get_exact to unix_lookup_by_ino has type
__u32, but unix_lookup_by_ino's argument ino has type int, which is not
a problem yet.
However, when ino is compared with sock_i_ino return value of type
unsigned long, ino is sign extended to signed long, and this results
to incorrect comparison on 64-bit architectures for inode numbers
greater than INT_MAX.

This bug was found by strace test suite.

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
Cc: <stable@...r.kernel.org>
---
 net/unix/diag.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/unix/diag.c b/net/unix/diag.c
index c512f64..4d96797 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -220,23 +220,23 @@ done:
 	return skb->len;
 }
 
-static struct sock *unix_lookup_by_ino(int ino)
+static struct sock *unix_lookup_by_ino(unsigned int ino)
 {
 	int i;
 	struct sock *sk;
 
 	spin_lock(&unix_table_lock);
 	for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
 		sk_for_each(sk, &unix_socket_table[i])
 			if (ino == sock_i_ino(sk)) {
 				sock_hold(sk);
 				spin_unlock(&unix_table_lock);
 
 				return sk;
 			}
 	}
 
 	spin_unlock(&unix_table_lock);
 	return NULL;
 }
 
-- 
ldv