[SCSI] drivers/scsi/sr_ioctl.c: check for failed allocation

I noticed a case in sr_ioctl.c's sr_get_mcn where a buffer is
allocated, but the pointer isn't checked for null.

Signed-off-by: Nate Dailey <nate.dailey@stratus.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index 3471be05779a..82d68fdb1548 100644
--- a/drivers/scsi/sr_ioctl.c
+++ b/drivers/scsi/sr_ioctl.c
@@ -281,6 +281,9 @@ int sr_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
         char *buffer = kmalloc(32, GFP_KERNEL | SR_GFP_DMA(cd));
         int result;
 
+        if (!buffer)
+                return -ENOMEM;
+
         memset(&cgc, 0, sizeof(struct packet_command));
         cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
         cgc.cmd[2] = 0x40;      /* I do want the subchannel info */