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[SCSI] fix sign extension with 1.5TB usb-storage LBD=y 

Shifting an unsigned char implicitly casts it to a signed int.  This
caused 'lba' to sign-extend and Linux would then try READ CAPACITY 16
which was not supported by at least one drive.  Using the
get_unaligned_be*() helpers keeps us from having to worry about how the
extension might occur.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Dave Hansen 2009-04-21 16:43:27 -07:00 committed by James Bottomley
parent dd406ef895
commit 8f76d151b0
1 changed files with 5 additions and 10 deletions
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15
drivers/scsi/sd.c
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@ -50,6 +50,7 @@
#include <linux/string_helpers.h>
#include <linux/async.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@ -1344,12 +1345,8 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
return -EINVAL;
}
sector_size = (buffer[8] << 24) | (buffer[9] << 16) |
(buffer[10] << 8) | buffer[11];
lba = (((u64)buffer[0] << 56) | ((u64)buffer[1] << 48) |
((u64)buffer[2] << 40) | ((u64)buffer[3] << 32) |
((u64)buffer[4] << 24) | ((u64)buffer[5] << 16) |
((u64)buffer[6] << 8) | (u64)buffer[7]);
sector_size = get_unaligned_be32(&buffer[8]);
lba = get_unaligned_be64(&buffer[0]);
sd_read_protection_type(sdkp, buffer);
@ -1400,10 +1397,8 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
return -EINVAL;
}
sector_size = (buffer[4] << 24) | (buffer[5] << 16) |
(buffer[6] << 8) | buffer[7];
lba = (buffer[0] << 24) | (buffer[1] << 16) |
(buffer[2] << 8) | buffer[3];
sector_size = get_unaligned_be32(&buffer[4]);
lba = get_unaligned_be32(&buffer[0]);
if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "