From: Mikhail Lobanov m.lobanov@rosalinux.ru

stable inclusion from stable-v5.10.227 commit dd598ac57dcae796cb58551074660c39b43fb155 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYQRV CVE: CVE-2024-47749

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ 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 Signed-off-by: Dong Chenchen dongchenchen2@huawei.com --- 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 8c54b1be0442..95300b2e1ffe 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;