From e2bbefc1741cb0732c13652be173da02f25611d1 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Mon, 3 Apr 2023 09:37:24 -0700
Subject: [PATCH] f2fs: fix null pointer panic in tracepoint in
__replace_atomic_write_block
commit da6ea0b050fa720302b56fbb59307e7c7531a342 upstream.
We got a kernel panic if old_addr is NULL.
https://bugzilla.kernel.org/show_bug.cgi?id=217266
BUG: kernel NULL pointer dereference, address: 0000000000000000
Call Trace:
<TASK>
f2fs_commit_atomic_write+0x619/0x990 [f2fs a1b985b80f5babd6f3ea778384908880812bfa43]
__f2fs_ioctl+0xd8e/0x4080 [f2fs a1b985b80f5babd6f3ea778384908880812bfa43]
? vfs_write+0x2ae/0x3f0
? vfs_write+0x2ae/0x3f0
__x64_sys_ioctl+0x91/0xd0
do_syscall_64+0x5c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f69095fe53f
Fixes: 2f3a9ae990a7 ("f2fs: introduce trace_f2fs_replace_atomic_write_block")
Cc: <stable@vger.kernel.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 17dc1857a72b9..a705c1d427162 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -263,7 +263,7 @@ 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;
}
--
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