On Fri, Nov 15, 2024 at 05:49:08PM +0800, Lizhi Xu wrote: > syzbot reported a null-ptr-deref in pick_link. [1] > When symlink's inode is corrupted, the value of the i_link is 2 in this case, > it will trigger null pointer deref when accessing *res in pick_link(). > > To avoid this issue, add a check for inode mode, return -EINVAL when it's > not symlink. NAK. Don't paper over filesystem bugs at pathwalk time - it's the wrong place for that. Fix it at in-core inode creation time.
