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| author | Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru> | 2024-03-07 14:23:50 +0000 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-26 18:22:36 -0400 |
| commit | 51a7e05fbca612ae1f09f62dfe21957380b8546d (patch) | |
| tree | e059287acef2519c020953f91b242db6622e82be | |
| parent | d909b53ff5b8f005b474b4417ee271f5a4adca94 (diff) | |
| download | linux-stable-51a7e05fbca612ae1f09f62dfe21957380b8546d.tar.gz linux-stable-51a7e05fbca612ae1f09f62dfe21957380b8546d.tar.bz2 linux-stable-51a7e05fbca612ae1f09f62dfe21957380b8546d.zip | |
l2tp: fix incorrect parameter validation in the pppol2tp_getsockopt() function
[ Upstream commit 955e9876ba4ee26eeaab1b13517f5b2c88e73d55 ]
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: 3557baabf280 ("[L2TP]: PPP over L2TP driver core")
Reviewed-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/l2tp/l2tp_ppp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index c0956781665e..3ed3b85f30b6 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1380,11 +1380,11 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, 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)); + err = -ENOTCONN; if (sk->sk_user_data == NULL) goto end; |