[SCSI] ch: Check NULL for kmalloc() return

Verify that ch->dt is not NULL before using it.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 7b1633a8c15a..fe11c1d4b31d 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -353,6 +353,12 @@ ch_readconfig(scsi_changer *ch)
         /* look up the devices of the data transfer elements */
         ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
                          GFP_KERNEL);
+
+        if (!ch->dt) {
+                kfree(buffer);
+                return -ENOMEM;
+        }
+
         for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
                 id  = -1;
                 lun = 0;