linux-kernel - [PATCH] fs/bfs: Null check to prevent null-ptr-deref bug

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Date: Fri,  5 Jan 2024 11:33:31 -0800
From: Xiaochen Zou <xzou017@....edu>
To: aivazian.tigran@...il.com
Cc: linux-kernel@...r.kernel.org,
	Xiaochen Zou <xzou017@....edu>
Subject: [PATCH] fs/bfs: Null check to prevent null-ptr-deref bug

Similar to ea2b62f3058 (fs/sysv: Null check to prevent
null-ptr-deref bug), bfs is lack of return value check for
sb_getblk(). Adding a null check to prevent null-ptr-defer bug

Signed-off-by: Xiaochen Zou <xzou017@....edu>
---
 fs/bfs/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index adc2230079c6..35688424bde3 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -39,6 +39,8 @@ static int bfs_move_block(unsigned long from, unsigned long to,
 	if (!bh)
 		return -EIO;
 	new = sb_getblk(sb, to);
+	if (unlikely(!new))
+		return -ENOMEM;
 	memcpy(new->b_data, bh->b_data, bh->b_size);
 	mark_buffer_dirty(new);
 	bforget(bh);
-- 
2.25.1