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btrfs-progs: fsck: Check bytenr alignment for extent item

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Check bytenr alignment for extent item to filter invalid items early.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2016-08-30 15:22:15 +08:00 committed by David Sterba
parent f51a34696b
commit 77deae9cb7
1 changed files with 15 additions and 0 deletions
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15
cmds-check.c
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@ -5422,6 +5422,11 @@ static int process_extent_item(struct btrfs_root *root,
num_bytes = key.offset;
}
if (!IS_ALIGNED(key.objectid, root->sectorsize)) {
error("ignoring invalid extent, bytenr %llu is not aligned to %u",
key.objectid, root->sectorsize);
return -EIO;
}
if (item_size < sizeof(*ei)) {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
struct btrfs_extent_item_v0 *ei0;
@ -5448,6 +5453,16 @@ static int process_extent_item(struct btrfs_root *root,
metadata = 1;
else
metadata = 0;
if (metadata && num_bytes != root->nodesize) {
error("ignore invalid metadata extent, length %llu does not equal to %u",
num_bytes, root->nodesize);
return -EIO;
}
if (!metadata && !IS_ALIGNED(num_bytes, root->sectorsize)) {
error("ignore invalid data extent, length %llu is not aligned to %u",
num_bytes, root->sectorsize);
return -EIO;
}
memset(&tmpl, 0, sizeof(tmpl));
tmpl.start = key.objectid;