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f2fs: sanity check checkpoint segno and blkoff

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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>

Change-Id: Ie2505c071233c1a9dec2729fe1ad467689a1b7a2
(cherry picked from commit 15d3042a937c13f5d9244241c7a9c8416ff6e82a)
This commit is contained in:
Jin Qian 2017-05-15 10:45:08 -07:00 committed by Sean McCreary
parent 46e0dfc447
commit 9e20025f8b
1 changed files with 18 additions and 0 deletions
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18
fs/f2fs/super.c
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@ -1178,6 +1178,8 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi)
unsigned int total, fsmeta;
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
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);
@ -1189,6 +1191,22 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi)
if (unlikely(fsmeta >= total))
return 1;
main_segs = le32_to_cpu(sbi->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;