btrfs: remove pointless and double ulist frees in error paths of qgroup tests

[ Upstream commit d0ea17aec12ea0f7b9d2ed727d8ef8169d1e7699 ]

Several places in the qgroup self tests follow the pattern of freeing the
ulist pointer they passed to btrfs_find_all_roots() if the call to that
function returned an error. That is pointless because that function always
frees the ulist in case it returns an error.

Also In some places like at test_multiple_refs(), after a call to
btrfs_qgroup_account_extent() we also leave "old_roots" and "new_roots"
pointing to ulists that were freed, because btrfs_qgroup_account_extent()
has freed those ulists, and if after that the next call to
btrfs_find_all_roots() fails, we call ulist_free() on the "old_roots"
ulist again, resulting in a double free.

So remove those calls to reduce the code size and avoid double ulist
free in case of an error.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/btrfs/tests/qgroup-tests.c b/fs/btrfs/tests/qgroup-tests.c
index a374b62c9de9e40b39cf179aac246f7eedacbb56..08c1abd6bb0c8453ab80a91bd80ca879270aab5f 100644 (file)
--- a/fs/btrfs/tests/qgroup-tests.c
+++ b/fs/btrfs/tests/qgroup-tests.c
@@ -225,7 +225,6 @@ static int test_no_shared_qgroup(struct btrfs_root *root,
         */
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &old_roots, false);
        if (ret) {
-               ulist_free(old_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -240,7 +239,6 @@ static int test_no_shared_qgroup(struct btrfs_root *root,
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &new_roots, false);
        if (ret) {
                ulist_free(old_roots);
-               ulist_free(new_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -252,17 +250,18 @@ static int test_no_shared_qgroup(struct btrfs_root *root,
                return ret;
        }
 
+       /* btrfs_qgroup_account_extent() always frees the ulists passed to it. */
+       old_roots = NULL;
+       new_roots = NULL;
+
        if (btrfs_verify_qgroup_counts(fs_info, BTRFS_FS_TREE_OBJECTID,
                                nodesize, nodesize)) {
                test_err("qgroup counts didn't match expected values");
                return -EINVAL;
        }
-       old_roots = NULL;
-       new_roots = NULL;
 
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &old_roots, false);
        if (ret) {
-               ulist_free(old_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -276,7 +275,6 @@ static int test_no_shared_qgroup(struct btrfs_root *root,
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &new_roots, false);
        if (ret) {
                ulist_free(old_roots);
-               ulist_free(new_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -326,7 +324,6 @@ static int test_multiple_refs(struct btrfs_root *root,
 
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &old_roots, false);
        if (ret) {
-               ulist_free(old_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -341,7 +338,6 @@ static int test_multiple_refs(struct btrfs_root *root,
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &new_roots, false);
        if (ret) {
                ulist_free(old_roots);
-               ulist_free(new_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -361,7 +357,6 @@ static int test_multiple_refs(struct btrfs_root *root,
 
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &old_roots, false);
        if (ret) {
-               ulist_free(old_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -376,7 +371,6 @@ static int test_multiple_refs(struct btrfs_root *root,
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &new_roots, false);
        if (ret) {
                ulist_free(old_roots);
-               ulist_free(new_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -402,7 +396,6 @@ static int test_multiple_refs(struct btrfs_root *root,
 
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &old_roots, false);
        if (ret) {
-               ulist_free(old_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }
@@ -417,7 +410,6 @@ static int test_multiple_refs(struct btrfs_root *root,
        ret = btrfs_find_all_roots(&trans, fs_info, nodesize, 0, &new_roots, false);
        if (ret) {
                ulist_free(old_roots);
-               ulist_free(new_roots);
                test_err("couldn't find old roots: %d", ret);
                return ret;
        }