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authorChao Yu <yuchao0@huawei.com>2018-01-27 17:29:49 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2018-03-13 08:05:32 +0900
commitbf617f7a92edc6bb2909db2bfa4576f50b280ee5 (patch)
treec41598918e4ffa95efc9a7c6530abb50b5e57b4a /fs/f2fs
parent4d817ae099883b08fddd46dee3a916bbf93e9161 (diff)
downloadlinux-bf617f7a92edc6bb2909db2bfa4576f50b280ee5.tar.bz2
f2fs: fix to check extent cache in f2fs_drop_extent_tree
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>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/extent_cache.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index ff2352a0ed15..aff6c2ed1c02 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -706,6 +706,9 @@ 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);