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fat: use fat_fs_error() instead of BUG_ON() in __fat_get_block()

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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.

[[email protected]: fix printk warning]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: OGAWA Hirofumi <[email protected]>
Reported-by: Anatoly Trosinenko <[email protected]>
Tested-by: Anatoly Trosinenko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
OGAWA Hirofumi 2018-06-14 15:27:21 -07:00 • committed by Linus Torvalds
commit c2574aaa5d
1 changed files with 7 additions and 1 deletions
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8
fs/fat/inode.c
View file

@ -158,8 +158,14 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
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 %llu)",
MSDOS_I(inode)->i_pos,
(unsigned long long)last_block);
return -EIO;
}
BUG_ON(!phys);
BUG_ON(*max_blocks != mapped_blocks);
set_buffer_new(bh_result);
map_bh(bh_result, sb, phys);