FROMLIST: f2fs: sanity check checkpoint segno and blkoff
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
Tracked-On: https://jira01.devtools.intel.com/browse/AW-6221
Signed-off-by: Victor Tasayco Loarte <victorx.tasayco.loarte@intel.com>
Reviewed-on: https://android.intel.com/594760
Reviewed-by: Louis, FabienX <fabienx.louis@intel.com>
Reviewed-by: Dubray, SimonX <simonx.dubray@intel.com>
Reviewed-by: Ledentec, AlexandreX <alexandrex.ledentec@intel.com>
Reviewed-by: Akue, LoicX <loicx.akue@intel.com>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 2be3a3d..114e163 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -458,6 +458,8 @@
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);
@@ -469,6 +471,22 @@
if (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 (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
return 1;
