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| author | Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru> | 2024-03-07 17:23:50 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-27 01:22:36 +0300 |
| commit | f21612ee652c08b4a5a0bb11528035f57935fae1 (patch) | |
| tree | 26c78c3d76fa986f5a33e17248948d219b683531 /net | |
| parent | 51a7e05fbca612ae1f09f62dfe21957380b8546d (diff) | |
| download | linux-f21612ee652c08b4a5a0bb11528035f57935fae1.tar.xz | |
udp: fix incorrect parameter validation in the udp_lib_getsockopt() function
[ Upstream commit 4bb3ba7b74fceec6f558745b25a43c6521cf5506 ]
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")
Reviewed-by: Willem de Bruijn <willemb@google.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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/udp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index a6048cc7fc35..6e4b26c6f97c 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2579,11 +2579,11 @@ int udp_lib_getsockopt(struct sock *sk, 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)); + switch (optname) { case UDP_CORK: val = READ_ONCE(up->corkflag); |