From 46e0dfc4474b1a095e7a89ace8014c2b17dc4133 Mon Sep 17 00:00:00 2001 From: Jin Qian Date: Tue, 25 Apr 2017 16:28:48 -0700 Subject: [PATCH] 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 Signed-off-by: Jaegeuk Kim Change-Id: I16b3cd6279bff1a221781a80b9b34744c9e7098f (cherry picked from commit b9dd46188edc2f0d1f37328637860bb65a771124) --- fs/f2fs/super.c | 7 +++++++ include/linux/f2fs_fs.h | 6 ++++++ 2 files changed, 13 insertions(+) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index a350fdc6f543..7686fe66ee42 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -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; diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h index 9eb215a155e0..5df00dadd968 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -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