[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>

diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index 3471be0..82d68fd 100644 (file)
--- 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 */