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btrfs: fix error pointer dereference after failure to allocate fs devices

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At device_list_add() we allocate a btrfs_fs_devices structure and then
before checking if the allocation failed (pointer is ERR_PTR(-ENOMEM)),
we dereference the error pointer in a memcpy() argument if the feature
BTRFS_FEATURE_INCOMPAT_METADATA_UUID is enabled.
Fix this by checking for an allocation error before trying the memcpy().

Fixes: f7361d8c3f ("btrfs: sipmlify uuid parameters of alloc_fs_devices()")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2023-10-30 11:54:23 +00:00 committed by David Sterba
parent 47e2b06b7b
commit cd63ffbd23
1 changed files with 3 additions and 3 deletions
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6
fs/btrfs/volumes.c
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@ -746,13 +746,13 @@ static noinline struct btrfs_device *device_list_add(const char *path,
if (!fs_devices) {
fs_devices = alloc_fs_devices(disk_super->fsid);
if (IS_ERR(fs_devices))
return ERR_CAST(fs_devices);
if (has_metadata_uuid)
memcpy(fs_devices->metadata_uuid,
disk_super->metadata_uuid, BTRFS_FSID_SIZE);
if (IS_ERR(fs_devices))
return ERR_CAST(fs_devices);
if (same_fsid_diff_dev) {
generate_random_uuid(fs_devices->fsid);
fs_devices->temp_fsid = true;