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tcp: fix incorrect parameter validation in the do_tcp_getsockopt() function

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[ Upstream commit 716edc9706deb3bb2ff56e2eeb83559cea8f22db ]

The 'len' variable can't be negative when assigned the result of
'min_t' because all 'min_t' parameters are cast to unsigned int,
and then the minimum one is chosen.

To fix the logic, check 'len' as read from 'optlen',
where the types of relevant variables are (signed) int.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gavrilov Ilia 2024-03-07 14:23:49 +00:00 committed by Sasha Levin
parent fb6639c748
commit 2e7f3cabc6
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp.c
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@ -3451,11 +3451,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
if (get_user(len, optlen))
return -EFAULT;
len = min_t(unsigned int, len, sizeof(int));
if (len < 0)
return -EINVAL;
len = min_t(unsigned int, len, sizeof(int));
switch (optname) {
case TCP_MAXSEG:
val = tp->mss_cache;