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f2fs: sanity check segment count

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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>

Change-Id: I16b3cd6279bff1a221781a80b9b34744c9e7098f
(cherry picked from commit b9dd46188edc2f0d1f37328637860bb65a771124)
This commit is contained in:
Jin Qian 2017-04-25 16:28:48 -07:00 committed by Sean McCreary
parent 5a34ec804c
commit 46e0dfc447
2 changed files with 13 additions and 0 deletions
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7
fs/f2fs/super.c
View file

@ -1159,6 +1159,13 @@ 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, bh))
return 1;

6
include/linux/f2fs_fs.h
View file

@ -284,6 +284,12 @@ struct f2fs_nat_block {
#define SIT_VBLOCK_MAP_SIZE 64
#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