This is a note to let you know that I've just added the patch titled
nvmet-tcp: fix kernel crash if commands allocation fails
to the 5.15-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:
nvmet-tcp-fix-kernel-crash-if-commands-allocation-fa.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9e16b3a71170b6625e98fe10b4fc663d59f2958a
Author: Maurizio Lombardi <mlombard@xxxxxxxxxx>
Date: Wed Aug 21 16:28:26 2024 +0200
nvmet-tcp: fix kernel crash if commands allocation fails
[ Upstream commit 5572a55a6f830ee3f3a994b6b962a5c327d28cb3 ]
If the commands allocation fails in nvmet_tcp_alloc_cmds()
the kernel crashes in nvmet_tcp_release_queue_work() because of
a NULL pointer dereference.
nvmet: failed to install queue 0 cntlid 1 ret 6
Unable to handle kernel NULL pointer dereference at
virtual address 0000000000000008
Fix the bug by setting queue->nr_cmds to zero in case
nvmet_tcp_alloc_cmd() fails.
Fixes: 872d26a391da ("nvmet-tcp: add NVMe over TCP target driver")
Signed-off-by: Maurizio Lombardi <mlombard@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index df044a79a734..809b03b86a00 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -1819,8 +1819,10 @@ static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
}
queue->nr_cmds = sq->size * 2;
- if (nvmet_tcp_alloc_cmds(queue))
+ if (nvmet_tcp_alloc_cmds(queue)) {
+ queue->nr_cmds = 0;
return NVME_SC_INTERNAL;
+ }
return 0;
}
