5.4-stable review patch. If anyone has any objections, please let me know.
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From: Mikhail Lobanov m.lobanov@rosalinux.ru
[ 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@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 --- drivers/infiniband/hw/cxgb4/cm.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index c7214c49f202f..01750eb5458e0 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -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;