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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: cfdda9d764 ("RDMA/cxgb4: Add driver for Chelsio T4 RNIC")
Signed-off-by: Mikhail Lobanov <m.lobanov@rosalinux.ru>
Link: https://patch.msgid.link/20240912145844.77516-1-m.lobanov@rosalinux.ru
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mikhail Lobanov 2024-09-12 10:58:39 -04:00 committed by Greg Kroah-Hartman
parent 21ada6915c
commit 0d50ae281a
1 changed files with 5 additions and 0 deletions
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5
drivers/infiniband/hw/cxgb4/cm.c
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@ -1222,6 +1222,8 @@ 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));
@ -2279,6 +2281,9 @@ 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;