[SCSI] fix use-after-free in scsi_init_io()

we're using a pointer through a freed command to reset the request,
which has shown up as an oops with slab poisoning:

Reported-by: Tejun Heo <tj@kernel.org>
Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9ade720422c6..ee02d3838a0a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1011,8 +1011,8 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 
 err_exit:
         scsi_release_buffers(cmd);
-        scsi_put_command(cmd);
         cmd->request->special = NULL;
+        scsi_put_command(cmd);
         return error;
 }
 EXPORT_SYMBOL(scsi_init_io);