diff options
| author | Jin Qian <jinqian@google.com> | 2017-04-25 16:28:48 -0700 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-05-21 18:43:16 +0200 |
| commit | 71a49311c55e38ba61eeb5ab96d147a35c6cba27 (patch) | |
| tree | 91e5adbe14fc8124b716d66a704a8344321679a5 | |
| parent | 3d60b060119facda54d1a7a23ac29e229e078b64 (diff) | |
| download | android_kernel_m2note-71a49311c55e38ba61eeb5ab96d147a35c6cba27.tar.gz | |
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 7e1664e9b..ede85fef4 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1481,6 +1481,13 @@ 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 acdeb7390..ef70be9c7 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_CACHE_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 |