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[SCSI] sd: Fix overflow with big physical blocks 

The hw_sector_size variable could overflow if a device reported huge
physical blocks.  Switch to the more accurate physical_block_size
terminology and make sure we use an unsigned int to match the range
permitted by READ CAPACITY(16).

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Martin K. Petersen 2010-09-28 14:48:47 -04:00 committed by James Bottomley
parent 3e51d3c924
commit 526f7c7950
2 changed files with 8 additions and 7 deletions
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13
drivers/scsi/sd.c
View File

@ -1554,7 +1554,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
}
/* Logical blocks per physical block exponent */
sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
/* Lowest aligned logical block */
alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
@ -1567,7 +1567,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
struct request_queue *q = sdp->request_queue;
sdkp->thin_provisioning = 1;
q->limits.discard_granularity = sdkp->hw_sector_size;
q->limits.discard_granularity = sdkp->physical_block_size;
q->limits.max_discard_sectors = 0xffffffff;
if (buffer[14] & 0x40) /* TPRZ */
@ -1635,7 +1635,7 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
}
sdkp->capacity = lba + 1;
sdkp->hw_sector_size = sector_size;
sdkp->physical_block_size = sector_size;
return sector_size;
}
@ -1756,10 +1756,10 @@ got_data:
(unsigned long long)sdkp->capacity,
sector_size, cap_str_10, cap_str_2);
if (sdkp->hw_sector_size != sector_size)
if (sdkp->physical_block_size != sector_size)
sd_printk(KERN_NOTICE, sdkp,
"%u-byte physical blocks\n",
sdkp->hw_sector_size);
sdkp->physical_block_size);
}
}
@ -1773,7 +1773,8 @@ got_data:
else if (sector_size == 256)
sdkp->capacity >>= 1;
blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
blk_queue_physical_block_size(sdp->request_queue,
sdkp->physical_block_size);
sdkp->device->sector_size = sector_size;
}

2
drivers/scsi/sd.h
View File

@ -51,7 +51,7 @@ struct scsi_disk {
atomic_t openers;
sector_t capacity; /* size in 512-byte sectors */
u32 index;
unsigned short hw_sector_size;
unsigned int physical_block_size;
u8 media_present;
u8 write_prot;
u8 protection_type;/* Data Integrity Field */