This is a note to let you know that I've just added the patch titled
ipmr: fix incorrect parameter validation in the ip_mroute_getsockopt() function
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipmr-fix-incorrect-parameter-validation-in-the-ip_mr.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 19c0698fcf841ed1129873de7ceec71bd9c6b32c
Author: Gavrilov Ilia <Ilia.Gavrilov@xxxxxxxxxxx>
Date: Thu Mar 7 14:23:50 2024 +0000
ipmr: fix incorrect parameter validation in the ip_mroute_getsockopt() function
[ Upstream commit 5c3be3e0eb44b7f978bb6cbb20ad956adb93f736 ]
The 'olr' 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 'olr' 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@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index e49242706b5f5..66eade3fb629f 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1603,9 +1603,11 @@ int ip_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
if (copy_from_sockptr(&olr, optlen, sizeof(int)))
return -EFAULT;
- olr = min_t(unsigned int, olr, sizeof(int));
if (olr < 0)
return -EINVAL;
+
+ olr = min_t(unsigned int, olr, sizeof(int));
+
if (copy_to_sockptr(optlen, &olr, sizeof(int)))
return -EFAULT;
if (copy_to_sockptr(optval, &val, olr))
