From fecbec3b86f21f7d7c71fa3525a204c415554a39 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 3 Dec 2019 14:24:58 +0300 Subject: [PATCH] btrfs: return error pointer from alloc_test_extent_buffer [ Upstream commit b6293c821ea8fa2a631a2112cd86cd435effeb8b ] Callers of alloc_test_extent_buffer have not correctly interpreted the return value as error pointer, as alloc_test_extent_buffer should behave as alloc_extent_buffer. The self-tests were unaffected but btrfs_find_create_tree_block could call both functions and that would cause problems up in the call chain. Fixes: faa2dbf004e8 ("Btrfs: add sanity tests for new qgroup accounting code") CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Dan Carpenter Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/extent_io.c | 6 ++++-- fs/btrfs/tests/free-space-tree-tests.c | 6 +++--- fs/btrfs/tests/qgroup-tests.c | 4 ++-- 3 files changed, 9 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 4d901200be13..37a28e2369b9 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4994,12 +4994,14 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, return eb; eb = alloc_dummy_extent_buffer(fs_info, start, nodesize); if (!eb) - return NULL; + return ERR_PTR(-ENOMEM); eb->fs_info = fs_info; again: ret = radix_tree_preload(GFP_NOFS); - if (ret) + if (ret) { + exists = ERR_PTR(ret); goto free_eb; + } spin_lock(&fs_info->buffer_lock); ret = radix_tree_insert(&fs_info->buffer_radix, start >> PAGE_SHIFT, eb); diff --git a/fs/btrfs/tests/free-space-tree-tests.c b/fs/btrfs/tests/free-space-tree-tests.c index a724d9a79bd2..5e3b875d87e2 100644 --- a/fs/btrfs/tests/free-space-tree-tests.c +++ b/fs/btrfs/tests/free-space-tree-tests.c @@ -476,9 +476,9 @@ static int run_test(test_func_t test_func, int bitmaps, u32 sectorsize, root->node = alloc_test_extent_buffer(root->fs_info, nodesize, nodesize); - if (!root->node) { - test_msg("Couldn't allocate dummy buffer\n"); - ret = -ENOMEM; + if (IS_ERR(root->node)) { + test_msg("couldn't allocate dummy buffer\n"); + ret = PTR_ERR(root->node); goto out; } btrfs_set_header_level(root->node, 0); diff --git a/fs/btrfs/tests/qgroup-tests.c b/fs/btrfs/tests/qgroup-tests.c index 9c6666692341..e0aa6b9786fa 100644 --- a/fs/btrfs/tests/qgroup-tests.c +++ b/fs/btrfs/tests/qgroup-tests.c @@ -488,9 +488,9 @@ int btrfs_test_qgroups(u32 sectorsize, u32 nodesize) */ root->node = alloc_test_extent_buffer(root->fs_info, nodesize, nodesize); - if (!root->node) { + if (IS_ERR(root->node)) { test_msg("Couldn't allocate dummy buffer\n"); - ret = -ENOMEM; + ret = PTR_ERR(root->node); goto out; } btrfs_set_header_level(root->node, 0); -- 2.20.1