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| author | Christoph Hellwig <hch@lst.de> | 2017-02-14 20:15:56 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-02-22 19:34:17 -0500 |
| commit | 6fa2b8f9e3ae8dd770d8fa264825f86b146381c8 (patch) | |
| tree | f685aa0424ea584c1d95a8d585ec12fa2e1b5c20 /drivers/scsi/sd.c | |
| parent | 148cff67b401e2229c076c0ea418712654be77e4 (diff) | |
| download | linux-6fa2b8f9e3ae8dd770d8fa264825f86b146381c8.tar.gz | |
scsi: sd: improve TUR handling in sd_check_events
Remove bogus evaluations of retval and sshdr when the device is offline, and fix a possible NULL pointer dereference by allocating the 8 byte sized sense header on stack. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 8e4f4f72ea64..be535d4215c4 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1425,7 +1425,6 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) { struct scsi_disk *sdkp = scsi_disk_get(disk); struct scsi_device *sdp; - struct scsi_sense_hdr *sshdr = NULL; int retval; if (!sdkp) @@ -1454,22 +1453,21 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever * sd_revalidate() is called. */ - retval = -ENODEV; - if (scsi_block_when_processing_errors(sdp)) { - sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); + struct scsi_sense_hdr sshdr = { 0, }; + retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, - sshdr); - } + &sshdr); - /* failed to execute TUR, assume media not present */ - if (host_byte(retval)) { - set_media_not_present(sdkp); - goto out; - } + /* failed to execute TUR, assume media not present */ + if (host_byte(retval)) { + set_media_not_present(sdkp); + goto out; + } - if (media_not_present(sdkp, sshdr)) - goto out; + if (media_not_present(sdkp, &sshdr)) + goto out; + } /* * For removable scsi disk we have to recognise the presence @@ -1485,7 +1483,6 @@ out: * Medium present state has changed in either direction. * Device has indicated UNIT_ATTENTION. */ - kfree(sshdr); retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; sdp->changed = 0; scsi_disk_put(sdkp); |