From: Jin Qian Date: Tue, 25 Apr 2017 23:28:48 +0000 (-0700) Subject: f2fs: sanity check segment count X-Git-Tag: C0P2-H0.0--20200415~9130 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=93862955cbf485215f0677229292d0f358af55fc;p=linux.git 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 Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 013c6a541d6b..7e0c002c12e9 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1405,6 +1405,13 @@ 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 422630b8e588..e46e7d10312b 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -285,6 +285,12 @@ struct f2fs_nat_block { #define SIT_VBLOCK_MAP_SIZE 64 #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