linux-kernel - [PATCH][next] btrfs: fix check for memory allocation failure of ret->path

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Date:   Tue, 21 Apr 2020 13:47:03 +0100
From:   Colin King <colin.king@...onical.com>
To:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Qu Wenruo <wqu@...e.com>, linux-btrfs@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] btrfs: fix check for memory allocation failure of ret->path

From: Colin Ian King <colin.king@...onical.com>

Currently the memory allocation failure check for ret->path is checking
that ret is null rather than ret->path.  Fix this by checking ret->path
instead.

Addresses-Coverity: ("Dereference null return")
Fixes: bd8bdc532152 ("btrfs: backref: introduce the skeleton of btrfs_backref_iter")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/btrfs/backref.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 60a69f7c0b36..78e6c9a64212 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -2307,7 +2307,7 @@ struct btrfs_backref_iter *btrfs_backref_iter_alloc(
 		return NULL;
 
 	ret->path = btrfs_alloc_path();
-	if (!ret) {
+	if (!ret->path) {
 		kfree(ret);
 		return NULL;
 	}
-- 
2.25.1