f2fs: remove WARN_ON in f2fs_is_valid_blkaddr

Syzbot triggers two WARNs in f2fs_is_valid_blkaddr and
__is_bitmap_valid. For example, in f2fs_is_valid_blkaddr,
if type is DATA_GENERIC_ENHANCE or DATA_GENERIC_ENHANCE_READ,
it invokes WARN_ON if blkaddr is not in the right range.
The call trace is as follows:

 f2fs_get_node_info+0x45f/0x1070
 read_node_page+0x577/0x1190
 __get_node_page.part.0+0x9e/0x10e0
 __get_node_page
 f2fs_get_node_page+0x109/0x180
 do_read_inode
 f2fs_iget+0x2a5/0x58b0
 f2fs_fill_super+0x3b39/0x7ca0

Fix these two WARNs by replacing WARN_ON with dump_stack.

Reported-by: syzbot+763ae12a2ede1d99d4dc@syzkaller.appspotmail.com
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 909085a78f9c3f0535d00e8c0bca06cf844d35fb..71b1e93cbe0cb8474e58e040b6899b24e1c7ecc7 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -158,7 +158,7 @@ static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr,
                f2fs_err(sbi, "Inconsistent error blkaddr:%u, sit bitmap:%d",
                         blkaddr, exist);
                set_sbi_flag(sbi, SBI_NEED_FSCK);
-               WARN_ON(1);
+               dump_stack();
        }
        return exist;
 }
@@ -196,7 +196,7 @@ bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
                        f2fs_warn(sbi, "access invalid blkaddr:%u",
                                  blkaddr);
                        set_sbi_flag(sbi, SBI_NEED_FSCK);
-                       WARN_ON(1);
+                       dump_stack();
                        return false;
                } else {
                        return __is_bitmap_valid(sbi, blkaddr, type);