Make sure segno and blkoff read from raw image are valid.
Cc: sta...@vger.kernel.org
Signed-off-by: Jin Qian <jinq...@google.com>
---
fs/f2fs/super.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 83355ec4a92c..c41b48e4cc33 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -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 +1544,22 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi)
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;
--
2.13.0.rc2.291.g57267f2277-goog
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