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libata: sanitize ata_tf_read_block()

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Return U64_MAX if ata_tf_read_block() could not decode the LBA
address, and do not set the information sense descriptor in
ata_gen_ata_sense() in these cases.

tj: s/(u64)-1/U64_MAX/

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Hannes Reinecke 2016-04-04 11:43:57 +02:00 committed by Tejun Heo
parent 5e6acd1c8c
commit cffd1ee991
3 changed files with 6 additions and 3 deletions
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4
drivers/ata/libata-core.c
View File

@ -695,7 +695,7 @@ static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
* RETURNS:
* Block address read from @tf.
*/
u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
u64 ata_tf_read_block(const struct ata_taskfile *tf, struct ata_device *dev)
{
u64 block = 0;
@ -720,7 +720,7 @@ u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
if (!sect) {
ata_dev_warn(dev,
"device reported invalid CHS sector 0\n");
sect = 1; /* oh well */
return U64_MAX;
}
block = (cyl * dev->heads + head) * dev->sectors + sect - 1;

2
drivers/ata/libata-scsi.c
View File

@ -1083,6 +1083,8 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
}
block = ata_tf_read_block(&qc->result_tf, dev);
if (block == U64_MAX)
return;
/* information sense data descriptor */
sb[7] = 12;

3
drivers/ata/libata.h
View File

@ -67,7 +67,8 @@ extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag);
extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
u64 block, u32 n_block, unsigned int tf_flags,
unsigned int tag);
extern u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev);
extern u64 ata_tf_read_block(const struct ata_taskfile *tf,
struct ata_device *dev);
extern unsigned ata_exec_internal(struct ata_device *dev,
struct ata_taskfile *tf, const u8 *cdb,
int dma_dir, void *buf, unsigned int buflen,