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Message-Id: <20240904023721.8534-1-ghanshyam1898@gmail.com>
Date: Wed, 4 Sep 2024 08:07:20 +0530
From: Ghanshyam Agrawal <ghanshyam1898@...il.com>
To: clm@...com,
josef@...icpanda.com,
dsterba@...e.com
Cc: Ghanshyam Agrawal <ghanshyam1898@...il.com>,
linux-btrfs@...r.kernel.org,
linux-kernel@...r.kernel.org,
syzbot+9c3e0cdfbfe351b0bc0e@...kaller.appspotmail.com
Subject: [PATCH] btrfs: Added null check to extent_root variable
Reported-by: syzbot+9c3e0cdfbfe351b0bc0e@...kaller.appspotmail.com
Closes:https://syzkaller.appspot.com/bug?extid=9c3e0cdfbfe351b0bc0e
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@...il.com>
---
fs/btrfs/ref-verify.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/btrfs/ref-verify.c b/fs/btrfs/ref-verify.c
index 9522a8b79d22..4e98ddf5e8df 100644
--- a/fs/btrfs/ref-verify.c
+++ b/fs/btrfs/ref-verify.c
@@ -1002,6 +1002,9 @@ int btrfs_build_ref_tree(struct btrfs_fs_info *fs_info)
return -ENOMEM;
extent_root = btrfs_extent_root(fs_info, 0);
+ if (!extent_root)
+ return -EIO;
+
eb = btrfs_read_lock_root_node(extent_root);
level = btrfs_header_level(eb);
path->nodes[level] = eb;
--
2.34.1
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