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FROMLIST: f2fs: sanity check checkpoint segno and blkoff

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

(url https://sourceforge.net/p/linux-f2fs/mailman/message/35835945)

Signed-off-by: Jin Qian <jinqian@google.com>
Bug: 36588520
Change-Id: Iba66ab97d3d0870ea48b5ef192d9075f225a934a
This commit is contained in:
Jin Qian
2017-05-11 16:15:15 -07:00
committed by Amit Pundir
parent e00ebdcb8a
commit 0f127e451b
1 changed files with 18 additions and 0 deletions
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18
fs/f2fs/super.c
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@@ -1078,6 +1078,8 @@ static 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);
@@ -1089,6 +1091,22 @@ static 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;