linux-kernel - Re: [PATCH] drivers/mmc/card/block.c: fix potential null dereference 'idata'

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Date:	Mon, 09 May 2011 18:08:28 +0200
From:	Vladimir Motyka <vladimir.motyka@...il.com>
To:	cjb@...top.org
CC:	Julia Lawall <julia@...u.dk>, kernel-janitors@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/mmc/card/block.c: fix potential null dereference
 'idata'

When allocation of idata fails there was a null dereference.

Signed-off-by: Vladimir Motyka <vladimir.motyka@...il.com>
---
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 407836d..a03cdc6 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -237,7 +237,7 @@ static struct mmc_blk_ioc_data
*mmc_blk_ioctl_copy_from_user(
 	idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 	if (!idata) {
 		err = -ENOMEM;
-		goto copy_err;
+		goto alloc_err;
 	}

 	if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
@@ -268,8 +268,8 @@ static struct mmc_blk_ioc_data
*mmc_blk_ioctl_copy_from_user(
 copy_err:
 	kfree(idata->buf);
 	kfree(idata);
+alloc_err:
 	return ERR_PTR(err);
-
 }

 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
--
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