4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Gu Jinxiang gujx@cn.fujitsu.com
commit 315409b0098fb2651d86553f0436b70502b29bb2 upstream.
Reported in https://bugzilla.kernel.org/show_bug.cgi?id=199839, with an image that has an invalid chunk type but does not return an error.
Add chunk type check in btrfs_check_chunk_valid, to detect the wrong type combinations.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=199839 Reported-by: Xu Wen wen.xu@gatech.edu Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Gu Jinxiang gujx@cn.fujitsu.com Signed-off-by: David Sterba dsterba@suse.com [bwh: Backported to 4.9: Use root->fs_info instead of fs_info] Signed-off-by: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/volumes.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
--- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -6370,6 +6370,8 @@ static int btrfs_check_chunk_valid(struc u16 num_stripes; u16 sub_stripes; u64 type; + u64 features; + bool mixed = false;
length = btrfs_chunk_length(leaf, chunk); stripe_len = btrfs_chunk_stripe_len(leaf, chunk); @@ -6410,6 +6412,32 @@ static int btrfs_check_chunk_valid(struc btrfs_chunk_type(leaf, chunk)); return -EIO; } + + if ((type & BTRFS_BLOCK_GROUP_TYPE_MASK) == 0) { + btrfs_err(root->fs_info, "missing chunk type flag: 0x%llx", type); + return -EIO; + } + + if ((type & BTRFS_BLOCK_GROUP_SYSTEM) && + (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA))) { + btrfs_err(root->fs_info, + "system chunk with data or metadata type: 0x%llx", type); + return -EIO; + } + + features = btrfs_super_incompat_flags(root->fs_info->super_copy); + if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) + mixed = true; + + if (!mixed) { + if ((type & BTRFS_BLOCK_GROUP_METADATA) && + (type & BTRFS_BLOCK_GROUP_DATA)) { + btrfs_err(root->fs_info, + "mixed chunk type in non-mixed mode: 0x%llx", type); + return -EIO; + } + } + if ((type & BTRFS_BLOCK_GROUP_RAID10 && sub_stripes != 2) || (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) || (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) ||