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| author |   OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2018-08-21 21:59:44 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-22 10:52:50 -0700 |
| commit | 0afa9626667c3659ef8bd82d42a11e39fedf235c (patch) | |
| tree | 9b5c96147d7eb18dc6d6b148e2f02c76b8ef9053 /fs/fat/fat.h | |
| parent | fat: add FITRIM ioctl for FAT file system (diff) | |
| download | wireguard-linux-0afa9626667c3659ef8bd82d42a11e39fedf235c.tar.xz wireguard-linux-0afa9626667c3659ef8bd82d42a11e39fedf235c.zip | |
fat: validate ->i_start before using
On corrupted FATfs may have invalid ->i_start. To handle it, this checks
->i_start before using, and return proper error code.
Link: http://lkml.kernel.org/r/87o9f8y1t5.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>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat/fat.h')
| -rw-r--r-- | fs/fat/fat.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 154ae54a6b3a..df84d5710b59 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -348,6 +348,11 @@ static inline void fatent_brelse(struct fat_entry *fatent) fatent->fat_inode = NULL; } +static inline bool fat_valid_entry(struct msdos_sb_info *sbi, int entry) +{ + return FAT_START_ENT <= entry && entry < sbi->max_cluster; +} + extern void fat_ent_access_init(struct super_block *sb); extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry); |