This is a note to let you know that I've just added the patch titled
scsi: fix random memory corruption with scsi-mq + T10 PI
to the 3.18-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-fix-random-memory-corruption-with-scsi-mq-t10-pi.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 120bb3e1e36da9c1ae6b978c825a28b944a5d7c5 Mon Sep 17 00:00:00 2001
From: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Date: Mon, 8 Dec 2014 17:20:52 -0500
Subject: scsi: fix random memory corruption with scsi-mq + T10 PI
From: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
commit 120bb3e1e36da9c1ae6b978c825a28b944a5d7c5 upstream.
This fixes random memory corruption triggered when all three of the
following are true:
* scsi-mq enabled
* T10 Protection Information (DIF) enabled
* SCSI host with sg_tablesize > SCSI_MAX_SG_SEGMENTS (128)
The symptoms of this bug are unpredictable memory corruption, BUG()s,
oopses, lockups, etc., any of which may appear to be completely
unrelated to the root cause.
Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Reviewed-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/scsi_lib.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1829,7 +1829,9 @@ static int scsi_mq_prep_fn(struct reques
if (scsi_host_get_prot(shost)) {
cmd->prot_sdb = (void *)sg +
- shost->sg_tablesize * sizeof(struct scatterlist);
+ min_t(unsigned int,
+ shost->sg_tablesize, SCSI_MAX_SG_SEGMENTS) *
+ sizeof(struct scatterlist);
memset(cmd->prot_sdb, 0, sizeof(struct scsi_data_buffer));
cmd->prot_sdb->table.sgl =
Patches currently in stable-queue which might be from tonyb@xxxxxxxxxxxxxxx are
queue-3.18/scsi-fix-random-memory-corruption-with-scsi-mq-t10-pi.patch
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