diff options
| author | Jin Qian <jinqian@google.com> | 2017-04-25 16:28:48 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-15 09:19:09 +0200 |
| commit | 27f411c7ee241d194cd5fd3271d83089d70b2c20 (patch) | |
| tree | 6e68243d8c853a34f7a3ddb91c97159c7f7c3097 | |
| parent | da2c082d62e93cb18397ff01d23f6d3de318ebd0 (diff) | |
f2fs: sanity check segment count
commit b9dd46188edc2f0d1f37328637860bb65a771124 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 ab09d8605e74..341466bcf180 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -913,6 +913,13 @@ static int sanity_check_raw_super(struct super_block *sb, 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(sb, raw_super)) return 1; diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h index 860313a33a43..2df22eab98e3 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -269,6 +269,12 @@ 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 |