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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2018-06-14 15:27:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-15 07:55:24 +0900
commitc2574aaa5d98684519f0dfa64abe6896aeb124c6 (patch)
tree413fcee242da40fce2775ff29838ed899798d656 /fs/fat
parent26b95137d673d8d6a9a124d433d968e18298f4ed (diff)
downloadlinux-next-c2574aaa5d98684519f0dfa64abe6896aeb124c6.tar.gz
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. [hirofumi@mail.parknet.co.jp: fix printk warning] Link: http://lkml.kernel.org/r/87po12aq5p.fsf@mail.parknet.co.jp Link: http://lkml.kernel.org/r/874lilcu67.fsf@mail.parknet.co.jp Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com> Tested-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat')
-rw-r--r--fs/fat/inode.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index ffbbf0520d9e..4f818f7fa155 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -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);