Re: [PATCH] f2fs: fix double free of f2fs_sb_info

[Eric Biggers <ebiggers@kernel.org>]

On Fri, Jan 12, 2024 at 04:57:47PM -0800, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> kill_f2fs_super() is called even if f2fs_fill_super() fails.
> f2fs_fill_super() frees the struct f2fs_sb_info, so it must set
> sb->s_fs_info to NULL to prevent it from being freed again.
> 
> Fixes: 275dca4630c1 ("f2fs: move release of block devices to after kill_block_super()")
> Reported-by: syzbot+8f477ac014ff5b32d81f@syzkaller.appspotmail.com
> Closes: https://lore.kernel.org/r/0000000000006cb174060ec34502@google.com
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Jaegeuk, I'd be glad to take this through the fscrypt tree since that's where my
broken commit came from.  But let me know if you want to just take this through
the f2fs tree.

- Eric