mmc: card: Avoid null pointer dereference

After the null check on md the code jumped to cmd_done, which then
will dereference md in mmc_blk_put. This patch avoids the possible
null pointer dereference in that case.

Signed-off-by: Philippe De Swert <philippedeswert@gmail.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index dabec556ebb8..91cda7551a60 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -384,7 +384,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
         md = mmc_blk_get(bdev->bd_disk);
         if (!md) {
                 err = -EINVAL;
-                goto cmd_done;
+                goto cmd_err;
         }
 
         card = md->queue.card;
@@ -483,6 +483,7 @@ cmd_rel_host:
 
 cmd_done:
         mmc_blk_put(md);
+cmd_err:
         kfree(idata->buf);
         kfree(idata);
         return err;