| From b9dd46188edc2f0d1f37328637860bb65a771124 Mon Sep 17 00:00:00 2001 |
| From: Jin Qian <jinqian@google.com> |
| Date: Tue, 25 Apr 2017 16:28:48 -0700 |
| Subject: f2fs: sanity check segment count |
| |
| From: Jin Qian <jinqian@google.com> |
| |
| 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> |
| |
| --- |
| fs/f2fs/super.c | 7 +++++++ |
| include/linux/f2fs_fs.h | 6 ++++++ |
| 2 files changed, 13 insertions(+) |
| |
| --- a/fs/f2fs/super.c |
| +++ b/fs/f2fs/super.c |
| @@ -1441,6 +1441,13 @@ static int sanity_check_raw_super(struct |
| 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; |
| --- a/include/linux/f2fs_fs.h |
| +++ b/include/linux/f2fs_fs.h |
| @@ -294,6 +294,12 @@ 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 |
