This is a note to let you know that I've just added the patch titled scsi: target: tcmu: Return from tcmu_handle_completions() if cmd_id not found to the 4.19-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: scsi-target-tcmu-return-from-tcmu_handle_completions.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a08393e9be145c97c4fa4b89fc57219267c8b8d4 Author: Bodo Stroesser <bostroesser@xxxxxxxxx> Date: Fri Apr 23 17:01:23 2021 +0200 scsi: target: tcmu: Return from tcmu_handle_completions() if cmd_id not found [ Upstream commit 9814b55cde0588b6d9bc496cee43f87316cbc6f1 ] If tcmu_handle_completions() finds an invalid cmd_id while looping over cmd responses from userspace it sets TCMU_DEV_BIT_BROKEN and breaks the loop. This means that it does further handling for the tcmu device. Skip that handling by replacing 'break' with 'return'. Additionally change tcmu_handle_completions() from unsigned int to bool, since the value used in return already is bool. Link: https://lore.kernel.org/r/20210423150123.24468-1-bostroesser@xxxxxxxxx Signed-off-by: Bodo Stroesser <bostroesser@xxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 0219b5a865be..dd7307375504 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -1216,7 +1216,7 @@ static void tcmu_set_next_deadline(struct list_head *queue, del_timer(timer); } -static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) +static bool tcmu_handle_completions(struct tcmu_dev *udev) { struct tcmu_mailbox *mb; struct tcmu_cmd *cmd; @@ -1256,7 +1256,7 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) pr_err("cmd_id %u not found, ring is broken\n", entry->hdr.cmd_id); set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); - break; + return false; } tcmu_handle_completion(cmd, entry);