linux-kernel - [PATCH] f2fs: fix null pointer panic in tracepoint in __replace_atomic_write

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Message-Id: <20230403165038.3018949-1-jaegeuk@kernel.org>
Date:   Mon,  3 Apr 2023 09:50:38 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: fix null pointer panic in tracepoint in __replace_atomic_write_block

We got a kernel panic if old_addr is NULL.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/segment.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 72bce3808394..2439d7029e64 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -257,7 +257,7 @@ static int __replace_atomic_write_block(struct inode *inode, pgoff_t index,
 	f2fs_put_dnode(&dn);
 
 	trace_f2fs_replace_atomic_write_block(inode, F2FS_I(inode)->cow_inode,
-					index, *old_addr, new_addr, recover);
+			index, old_addr ? *old_addr : 0, new_addr, recover);
 	return 0;
 }
 
-- 
2.40.0.348.gf938b09366-goog