This is a note to let you know that I've just added the patch titled
RDMA/cxgb4: Added NULL check for lookup_atid
to the 4.19-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:
rdma-cxgb4-added-null-check-for-lookup_atid.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 877b63a1dd98ddce7da690fe7a71cb4a28c1e53c
Author: Mikhail Lobanov <m.lobanov@xxxxxxxxxxxx>
Date: Thu Sep 12 10:58:39 2024 -0400
RDMA/cxgb4: Added NULL check for lookup_atid
[ Upstream commit e766e6a92410ca269161de059fff0843b8ddd65f ]
The lookup_atid() function can return NULL if the ATID is
invalid or does not exist in the identifier table, which
could lead to dereferencing a null pointer without a
check in the `act_establish()` and `act_open_rpl()` functions.
Add a NULL check to prevent null pointer dereferencing.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: cfdda9d76436 ("RDMA/cxgb4: Add driver for Chelsio T4 RNIC")
Signed-off-by: Mikhail Lobanov <m.lobanov@xxxxxxxxxxxx>
Link: https://patch.msgid.link/20240912145844.77516-1-m.lobanov@xxxxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index e8d2135df22db..f9ea863a80885 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1180,6 +1180,8 @@ static int act_establish(struct c4iw_dev *dev, struct sk_buff *skb)
int ret;
ep = lookup_atid(t, atid);
+ if (!ep)
+ return -EINVAL;
pr_debug("ep %p tid %u snd_isn %u rcv_isn %u\n", ep, tid,
be32_to_cpu(req->snd_isn), be32_to_cpu(req->rcv_isn));
@@ -2235,6 +2237,9 @@ static int act_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
int ret = 0;
ep = lookup_atid(t, atid);
+ if (!ep)
+ return -EINVAL;
+
la = (struct sockaddr_in *)&ep->com.local_addr;
ra = (struct sockaddr_in *)&ep->com.remote_addr;
la6 = (struct sockaddr_in6 *)&ep->com.local_addr;
