This is a note to let you know that I've just added the patch titled

ata: fixes kernel crash while tracing ata_eh_link_autopsy event

to the 4.14-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: ata-fixes-kernel-crash-while-tracing-ata_eh_link_autopsy-event.patch and it can be found in the queue-4.14 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 f1601113ddc0339a745e702f4fb1ca37d4875e65 Mon Sep 17 00:00:00 2001

From: Rameshwar Prasad Sahu rsahu@apm.com Date: Thu, 2 Nov 2017 16:31:07 +0530 Subject: ata: fixes kernel crash while tracing ata_eh_link_autopsy event

From: Rameshwar Prasad Sahu rsahu@apm.com

commit f1601113ddc0339a745e702f4fb1ca37d4875e65 upstream.

When tracing ata link error event, the kernel crashes when the disk is removed due to NULL pointer access by trace_ata_eh_link_autopsy API. This occurs as the dev is NULL when the disk disappeared. This patch fixes this crash by calling trace_ata_eh_link_autopsy only if "dev" is not NULL.

v2 changes: Removed direct passing "link" pointer instead of "dev" in trace API.

Signed-off-by: Rameshwar Prasad Sahu rsahu@apm.com Signed-off-by: Tejun Heo tj@kernel.org Fixes: 255c03d15a29 ("libata: Add tracepoints") Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/ata/libata-eh.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2264,8 +2264,8 @@ static void ata_eh_link_autopsy(struct a if (dev->flags & ATA_DFLAG_DUBIOUS_XFER) eflags |= ATA_EFLAG_DUBIOUS_XFER; ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask); + trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask); } - trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask); DPRINTK("EXIT\n"); }

Patches currently in stable-queue which might be from rsahu@apm.com are

queue-4.14/ata-fixes-kernel-crash-while-tracing-ata_eh_link_autopsy-event.patch