The syzbot reproducer mounts a f2fs image, then tries to unlink an existing file. However, the unlinked file already has a link count of 0 when it is read for the first time in do_read_inode().
Add a check to sanity_check_inode() for i_nlink == 0. Reported-by: syzbot+b01a36acd7007e273...@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=b01a36acd7007e273a83 Fixes: 5d64600d4f33 ("f2fs: avoid bug_on on corrupted inode") Signed-off-by: Leo Stone <leocst...@gmail.com> --- v2: Correct "Fixes" line v1: https://lore.kernel.org/all/20241124010459.23283-1-leocst...@gmail.com/T/ --- fs/f2fs/inode.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 1ed86df343a5..65f1dc32f173 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -372,6 +372,12 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page) return false; } + if (inode->i_nlink == 0) { + f2fs_warn(sbi, "%s: inode (ino=%lx) has a link count of 0", + __func__, inode->i_ino); + return false; + } + return true; } -- 2.43.0 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
