Thank you, it works!
сб, 2 июн. 2018 г. в 14:19, OGAWA Hirofumi <hirof...@mail.parknet.co.jp>:
>
> Anatoly Trosinenko <anatoly.trosine...@gmail.com> writes:
>
> > Description:
> >
> > Writing to some file on a broken VFAT partition causes kernel bug
>
> Thanks. This patch should fix this issue.
> --
> OGAWA Hirofumi <hirof...@mail.parknet.co.jp>
>
>
> [PATCH] fat: Use fat_fs_error() instead of BUG_ON() in __fat_get_block()
>
> If file size and FAT cluster chain is not matched (corrupted image),
> we can hit BUG_ON(!phys) in __fat_get_block().
>
> So, use fat_fs_error() instead.
>
> Signed-off-by: OGAWA Hirofumi <hirof...@mail.parknet.co.jp>
> ---
>
> fs/fat/inode.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff -puN fs/fat/inode.c~vfat-dont-bugon fs/fat/inode.c
> --- linux/fs/fat/inode.c~vfat-dont-bugon 2018-06-02 20:15:04.441920069
> +0900
> +++ linux-hirofumi/fs/fat/inode.c 2018-06-02 20:15:04.442920067 +0900
> @@ -158,8 +158,13 @@ static inline int __fat_get_block(struct
> err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false);
> if (err)
> return err;
> + if (!phys) {
> + fat_fs_error(sb,
> + "invalid FAT chain (i_pos %lld, last_block %ld)",
> + MSDOS_I(inode)->i_pos, last_block);
> + return -EIO;
> + }
>
> - BUG_ON(!phys);
> BUG_ON(*max_blocks != mapped_blocks);
> set_buffer_new(bh_result);
> map_bh(bh_result, sb, phys);
> _
--
Anatoly
