libata: sanitize ata_tf_read_block()

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>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f991f78..7bdb2c4 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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;

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index e331077..fc23d3f 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -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;

diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 8cfdd96..507c22f 100644 (file)
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -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,