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authorChao Yu <yuchao0@huawei.com>2019-04-15 15:28:37 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2019-05-08 21:23:09 -0700
commit22d61e286e2d9097dae36f75ed48801056b77cac (patch)
tree8abf43b2f07de479effeb3d00674e42901af15f0 /fs/f2fs
parent626bcf2b7ce87211dba565f2bfa7842ba5be5c1b (diff)
downloadlinux-22d61e286e2d9097dae36f75ed48801056b77cac.tar.bz2
f2fs: fix to avoid panic in do_recover_data()
As Jungyeon reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203227 - Overview When mounting the attached crafted image, following errors are reported. Additionally, it hangs on sync after trying to mount it. The image is intentionally fuzzed from a normal f2fs image for testing. Compile options for F2FS are as follows. CONFIG_F2FS_FS=y CONFIG_F2FS_STAT_FS=y CONFIG_F2FS_FS_XATTR=y CONFIG_F2FS_FS_POSIX_ACL=y CONFIG_F2FS_CHECK_FS=y - Reproduces mkdir test mount -t f2fs tmp.img test sync - Messages kernel BUG at fs/f2fs/recovery.c:549! RIP: 0010:recover_data+0x167a/0x1780 Call Trace: f2fs_recover_fsync_data+0x613/0x710 f2fs_fill_super+0x1043/0x1aa0 mount_bdev+0x16d/0x1a0 mount_fs+0x4a/0x170 vfs_kern_mount+0x5d/0x100 do_mount+0x200/0xcf0 ksys_mount+0x79/0xc0 __x64_sys_mount+0x1c/0x20 do_syscall_64+0x43/0xf0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 During recovery, if ofs_of_node is inconsistent in between recovered node page and original checkpointed node page, let's just fail recovery instead of making kernel panic. 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/recovery.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index d4f9d5408103..b14c718139a9 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -551,7 +551,15 @@ retry_dn:
goto err;
f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
- f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
+
+ if (ofs_of_node(dn.node_page) != ofs_of_node(page)) {
+ f2fs_msg(sbi->sb, KERN_WARNING,
+ "Inconsistent ofs_of_node, ino:%lu, ofs:%u, %u",
+ inode->i_ino, ofs_of_node(dn.node_page),
+ ofs_of_node(page));
+ err = -EFAULT;
+ goto err;
+ }
for (; start < end; start++, dn.ofs_in_node++) {
block_t src, dest;