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authorRusty Russell <rusty@rustcorp.com.au>2007-11-19 11:28:48 +1100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-11 18:22:50 -0600
commit4a03d90e35bc5273d27301fa669d4b2103196f94 (patch)
treea2ce1aa93b63ed3b8ac1adf9bd696f57fbf3c8ca
parenta8aae4d3427a5cf7c92b50125e35ea6cb9ba7394 (diff)
[SCSI] BUG_ON() impossible condition in sg list counting
If blk_rq_map_sg wrote more than was allocated in the scatterlist, BUG_ON() is probably the right thing to do. [jejb: rejections fixed up] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/scsi_lib.c15
-rw-r--r--drivers/scsi/scsi_tgt_lib.c11
2 files changed, 6 insertions, 20 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b0c59ae63a2..aa17e718666 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1104,7 +1104,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
*
* Returns: 0 on success
* BLKPREP_DEFER if the failure is retryable
- * BLKPREP_KILL if the failure is fatal
*/
static int scsi_init_io(struct scsi_cmnd *cmd)
{
@@ -1138,17 +1137,9 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
* each segment.
*/
count = blk_rq_map_sg(req->q, req, cmd->request_buffer);
- if (likely(count <= cmd->use_sg)) {
- cmd->use_sg = count;
- return BLKPREP_OK;
- }
-
- printk(KERN_ERR "Incorrect number of segments after building list\n");
- printk(KERN_ERR "counted %d, received %d\n", count, cmd->use_sg);
- printk(KERN_ERR "req nr_sec %lu, cur_nr_sec %u\n", req->nr_sectors,
- req->current_nr_sectors);
-
- return BLKPREP_KILL;
+ BUG_ON(count > cmd->use_sg);
+ cmd->use_sg = count;
+ return BLKPREP_OK;
}
static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index 241815e911e..93ece8f4e5d 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -368,14 +368,9 @@ static int scsi_tgt_init_cmd(struct scsi_cmnd *cmd, gfp_t gfp_mask)
dprintk("cmd %p cnt %d %lu\n", cmd, scsi_sg_count(cmd),
rq_data_dir(rq));
count = blk_rq_map_sg(rq->q, rq, scsi_sglist(cmd));
- if (likely(count <= scsi_sg_count(cmd))) {
- cmd->use_sg = count;
- return 0;
- }
-
- eprintk("cmd %p cnt %d\n", cmd, scsi_sg_count(cmd));
- scsi_free_sgtable(cmd);
- return -EINVAL;
+ BUG_ON(count > cmd->use_sg);
+ cmd->use_sg = count;
+ return 0;
}
/* TODO: test this crap and replace bio_map_user with new interface maybe */