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Message-ID: <20241108023717.8613-1-sarvesh20123@gmail.com>
Date: Fri, 8 Nov 2024 08:07:17 +0530
From: Saru2003 <sarvesh20123@...il.com>
To: viro@...iv.linux.org.uk
Cc: brauner@...nel.org,
jack@...e.cz,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Saru2003 <sarvesh20123@...il.com>
Subject: [PATCH] Fixed null-ptr-deref Read in drop_buffers
Signed-off-by: Saru2003 <sarvesh20123@...il.com>
---
fs/buffer.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/buffer.c b/fs/buffer.c
index 1fc9a50def0b..e32420d8b9e3 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2888,14 +2888,23 @@ drop_buffers(struct folio *folio, struct buffer_head **buffers_to_free)
struct buffer_head *head = folio_buffers(folio);
struct buffer_head *bh;
+ if (!head) {
+ goto failed;
+ }
+
bh = head;
do {
+ if (!bh)
+ goto failed;
if (buffer_busy(bh))
goto failed;
bh = bh->b_this_page;
} while (bh != head);
do {
+ if (!bh)
+ goto failed;
+
struct buffer_head *next = bh->b_this_page;
if (bh->b_assoc_map)
--
2.43.0
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