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unix_diag: fix incorrect sign extension in unix_lookup_by_ino

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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.

Fixes: 5d3cae8bc3 ("unix_diag: Dumping exact socket core")
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry V. Levin 2016-02-19 04:27:48 +03:00 committed by David S. Miller
parent 5a0e2f2622
commit b5f0549231
1 changed files with 1 additions and 1 deletions
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2
net/unix/diag.c
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@ -220,7 +220,7 @@ static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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;