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| author |   Jin Qian <jinqian@google.com> | 2017-04-25 16:28:48 -0700 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk@kernel.org> | 2017-05-02 21:19:48 -0700 |
| commit | b9dd46188edc2f0d1f37328637860bb65a771124 (patch) | |
| tree | 9476c2adfe493a9b3f91f3e8363a3e269b21cde6 | |
| parent | f2fs: introduce valid_ipu_blkaddr to clean up (diff) | |
| download | wireguard-linux-b9dd46188edc2f0d1f37328637860bb65a771124.tar.xz wireguard-linux-b9dd46188edc2f0d1f37328637860bb65a771124.zip | |
f2fs: sanity check segment count
F2FS uses 4 bytes to represent block address. As a result, supported
size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
Signed-off-by: Jin Qian <jinqian@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/super.c | 7 | ||||
| -rw-r--r-- | include/linux/f2fs_fs.h | 6 |
2 files changed, 13 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 97c07a5153e9..4cd3bee6775f 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1494,6 +1494,13 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi, return 1; } + if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) { + f2fs_msg(sb, KERN_INFO, + "Invalid segment count (%u)", + le32_to_cpu(raw_super->segment_count)); + return 1; + } + /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */ if (sanity_check_area_boundary(sbi, bh)) return 1; diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h index 639cbdf65e2b..093549e10ee2 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -302,6 +302,12 @@ struct f2fs_nat_block { #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) /* + * F2FS uses 4 bytes to represent block address. As a result, supported size of + * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. + */ +#define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) + +/* * Note that f2fs_sit_entry->vblocks has the following bit-field information. * [15:10] : allocation type such as CURSEG_XXXX_TYPE * [9:0] : valid block count |