Add scsi fix

1 files changed, 102 insertions, 0 deletions

diff --git a/scsi-fix-the-dma_max_mapping_size-call.patch b/scsi-fix-the-dma_max_mapping_size-call.patch
new file mode 100644
index 000000000..345996303
--- /dev/null
+++ b/scsi-fix-the-dma_max_mapping_size-call.patch
@@ -0,0 +1,102 @@
+From patchwork Mon Jul 22 09:20:38 2019
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+        id 1hpUUs-0002Si-9l; Mon, 22 Jul 2019 09:20:42 +0000
+From: Christoph Hellwig <hch@lst.de>
+To: martin.petersen@oracle.com
+Cc: bvanassche@acm.org, tom.leiming@gmail.com, dexuan.linux@gmail.com,
+        Damien.LeMoal@wdc.com, linux-scsi@vger.kernel.org
+Subject: [PATCH] scsi: fix the dma_max_mapping_size call
+Date: Mon, 22 Jul 2019 11:20:38 +0200
+Message-Id: <20190722092038.17659-1-hch@lst.de>
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+
+We should only call dma_max_mapping_size for devices that have a DMA
+mask set, otherwise we can run into a NULL pointer dereference that
+will crash the system.
+
+Also we need to do right shift to get the sectors from the size in
+bytes, not a left shift.
+
+Fixes: bdd17bdef7d8 ("scsi: core: take the DMA max mapping size into account")
+Reported-by: Bart Van Assche <bvanassche@acm.org>
+Reported-by: Ming Lei <tom.leiming@gmail.com>
+Signed-off-by: Christoph Hellwig <hch@lst.de>
+Tested-by: Guilherme G. Piccoli <gpiccoli@canonical.com>
+---
+ drivers/scsi/scsi_lib.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
+index 9381171c2fc0..11e64b50497f 100644
+--- a/drivers/scsi/scsi_lib.c
++++ b/drivers/scsi/scsi_lib.c
+@@ -1784,8 +1784,10 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
+ 		blk_queue_max_integrity_segments(q, shost->sg_prot_tablesize);
+ 	}
+ 
+-	shost->max_sectors = min_t(unsigned int, shost->max_sectors,
+-			dma_max_mapping_size(dev) << SECTOR_SHIFT);
++	if (dev->dma_mask) {
++		shost->max_sectors = min_t(unsigned int, shost->max_sectors,
++				dma_max_mapping_size(dev) >> SECTOR_SHIFT);
++	}
+ 	blk_queue_max_hw_sectors(q, shost->max_sectors);
+ 	if (shost->unchecked_isa_dma)
+ 		blk_queue_bounce_limit(q, BLK_BOUNCE_ISA);