diff options
| author | Chao Yu <yuchao0@huawei.com> | 2018-01-27 17:29:49 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:50:46 +0200 |
| commit | d3ab3aa8adcab55141696049936d247b7a62b40f (patch) | |
| tree | 96d9579b15d75e36adb6069ff96282f767df0e3f | |
| parent | a9d617543c89ed41238de8bd4209801089f105f9 (diff) | |
f2fs: fix to check extent cache in f2fs_drop_extent_tree
[ Upstream commit bf617f7a92edc6bb2909db2bfa4576f50b280ee5 ]
If noextent_cache mount option is on, we will never initialize extent tree
in inode, but still we're going to access it in f2fs_drop_extent_tree,
result in kernel panic as below:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
IP: _raw_write_lock+0xc/0x30
Call Trace:
? f2fs_drop_extent_tree+0x41/0x70 [f2fs]
f2fs_fallocate+0x5a0/0xdd0 [f2fs]
? common_file_perm+0x47/0xc0
? apparmor_file_permission+0x1a/0x20
vfs_fallocate+0x15b/0x290
SyS_fallocate+0x44/0x70
do_syscall_64+0x6e/0x160
entry_SYSCALL64_slow_path+0x25/0x25
This patch fixes to check extent cache status before using in
f2fs_drop_extent_tree.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/f2fs/extent_cache.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c index 63e519658d73..d7b8c8b5fc39 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -647,6 +647,9 @@ void f2fs_drop_extent_tree(struct inode *inode) struct f2fs_sb_info *sbi = F2FS_I_SB(inode); struct extent_tree *et = F2FS_I(inode)->extent_tree; + if (!f2fs_may_extent_tree(inode)) + return; + set_inode_flag(inode, FI_NO_EXTENT); write_lock(&et->lock); |