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f2fs: sanity check checkpoint segno and blkoff 

Make sure segno and blkoff read from raw image are valid.

Cc: stable@vger.kernel.org
Signed-off-by: Jin Qian <jinqian@google.com>
[Jaegeuk Kim: adjust minor coding style]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jin Qian 2017-05-15 10:45:08 -07:00 committed by Jaegeuk Kim
parent 2d3e4866de
commit 15d3042a93
1 changed files with 16 additions and 0 deletions
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16
fs/f2fs/super.c
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@ -1521,6 +1521,8 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi)
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
unsigned int ovp_segments, reserved_segments;
unsigned int main_segs, blocks_per_seg;
int i;
total = le32_to_cpu(raw_super->segment_count);
fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
@ -1542,6 +1544,20 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi)
return 1;
}
main_segs = le32_to_cpu(raw_super->segment_count_main);
blocks_per_seg = sbi->blocks_per_seg;
for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
return 1;
}
for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
return 1;
}
if (unlikely(f2fs_cp_error(sbi))) {
f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
return 1;