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OGAWA Hirofumi 796f99a7b7 fat: fix fat_ra_init() for data clusters == 0

[ Upstream commit a090a5a7d7 ]

If data clusters == 0, fat_ra_init() calls the ->ent_blocknr() for the
cluster beyond ->max_clusters.

This checks the limit before initialization to suppress the warning.

Reported-by: syzbot+756199124937b31a9b7e@syzkaller.appspotmail.com
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/87mu462sv4.fsf@mail.parknet.co.jp
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-08-26 11:49:07 +02:00

cache.c

fat: new inline functions to determine the FAT variant (32, 16 or 12)

2019-01-04 13:13:47 -08:00

dir.c

fat_dir_ioctl(): hadn't needed that access_ok() for more than a decade...

2020-05-09 15:57:04 -04:00

fat.h

fat: new inline functions to determine the FAT variant (32, 16 or 12)

2019-01-04 13:13:47 -08:00

fatent.c

fat: fix fat_ra_init() for data clusters == 0