This is a note to let you know that I've just added the patch titled
RDMA/iw_cxgb4: Avoid touch after free error in ARP failure handlers
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: rdma-iw_cxgb4-avoid-touch-after-free-error-in-arp-failure-handlers.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Apr 9 17:09:24 CEST 2018
From: Raju Rangoju rajur@chelsio.com Date: Mon, 15 May 2017 06:40:39 +0000 Subject: RDMA/iw_cxgb4: Avoid touch after free error in ARP failure handlers
From: Raju Rangoju rajur@chelsio.com
[ Upstream commit 1dad0ebeea1cd890b8892523f736916e245b0aef ]
The patch 761e19a504af (RDMA/iw_cxgb4: Handle return value of c4iw_ofld_send() in abort_arp_failure()) from May 6, 2016 leads to the following static checker warning: drivers/infiniband/hw/cxgb4/cm.c:575 abort_arp_failure() warn: passing freed memory 'skb'
Also fixes skb leak when l2t resolution fails
Fixes: 761e19a504afa55 (RDMA/iw_cxgb4: Handle return value of c4iw_ofld_send() in abort_arp_failure()) Reported-by: Dan Carpenter dan.carpenter@oracle.com Cc: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Raju Rangoju rajur@chelsio.com Reviewed-by: Steve Wise swise@opengridcomputing.com Signed-off-by: Doug Ledford dledford@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/infiniband/hw/cxgb4/cm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -488,6 +488,7 @@ static int _put_ep_safe(struct c4iw_dev
ep = *((struct c4iw_ep **)(skb->cb + 2 * sizeof(void *))); release_ep_resources(ep); + kfree_skb(skb); return 0; }
@@ -498,6 +499,7 @@ static int _put_pass_ep_safe(struct c4iw ep = *((struct c4iw_ep **)(skb->cb + 2 * sizeof(void *))); c4iw_put_ep(&ep->parent_ep->com); release_ep_resources(ep); + kfree_skb(skb); return 0; }
@@ -569,11 +571,13 @@ static void abort_arp_failure(void *hand
PDBG("%s rdev %p\n", __func__, rdev); req->cmd = CPL_ABORT_NO_RST; + skb_get(skb); ret = c4iw_ofld_send(rdev, skb); if (ret) { __state_set(&ep->com, DEAD); queue_arp_failure_cpl(ep, skb, FAKE_CPL_PUT_EP_SAFE); - } + } else + kfree_skb(skb); }
static int send_flowc(struct c4iw_ep *ep)
Patches currently in stable-queue which might be from rajur@chelsio.com are
queue-4.9/rdma-iw_cxgb4-avoid-touch-after-free-error-in-arp-failure-handlers.patch