[PATCH] mm/block: logical error fix to avoid memory leak

["Liu, Changcheng" <changcheng.liu@xxxxxxxxx>]

function:  mmc_ext_csd_open
{
+-- 33 lines: struct mmc_card *card = inode->i_private;--
    if (n != EXT_CSD_STR_LEN) {
        err = -EINVAL;
        goto out_free;  //==>should free ext_csd firstly.
    }
+--  2 lines: filp->private_data = buf;------------------
    kfree(ext_csd);
    return 0;

out_free:
    kfree(buf);
    return err;
}

Signed-off-by: Liu Changcheng <changcheng.liu@xxxxxxxxx>

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index ccfa98a..b737a95 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2623,6 +2623,7 @@ static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
 
 	if (n != EXT_CSD_STR_LEN) {
 		err = -EINVAL;
+		kfree(ext_csd);
 		goto out_free;
 	}
 
-- 
2.7.4

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