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mmc: card: Avoid null pointer dereference

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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>
This commit is contained in:
Philippe De Swert 2012-04-11 23:31:45 +03:00 committed by Chris Ball
parent fa5501890d
commit 1c02f000e7
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/card/block.c
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@ -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;