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| author | Qu Wenruo <wqu@suse.com> | 2023-09-19 11:44:42 +0930 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-09-20 20:44:57 +0200 |
| commit | 74ee79142c0a344d4eae2eb7012ebc4e82254109 (patch) | |
| tree | f326e758d3cb916d35175294b6c9f93eb0b9d221 /fs | |
| parent | 58bfe2ccec5f9f137b41dd38f335290dcc13cd5c (diff) | |
| download | linux-74ee79142c0a344d4eae2eb7012ebc4e82254109.tar.gz | |
btrfs: reset destination buffer when read_extent_buffer() gets invalid range
Commit f98b6215d7d1 ("btrfs: extent_io: do extra check for extent buffer
read write functions") changed how we handle invalid extent buffer range
for read_extent_buffer().
Previously if the range is invalid we just set the destination to zero,
but after the patch we do nothing and error out.
This can lead to smatch static checker errors like:
fs/btrfs/print-tree.c:186 print_uuid_item() error: uninitialized symbol 'subvol_id'.
fs/btrfs/tests/extent-io-tests.c:338 check_eb_bitmap() error: uninitialized symbol 'has'.
fs/btrfs/tests/extent-io-tests.c:353 check_eb_bitmap() error: uninitialized symbol 'has'.
fs/btrfs/uuid-tree.c:203 btrfs_uuid_tree_remove() error: uninitialized symbol 'read_subid'.
fs/btrfs/uuid-tree.c:353 btrfs_uuid_tree_iterate() error: uninitialized symbol 'subid_le'.
fs/btrfs/uuid-tree.c:72 btrfs_uuid_tree_lookup() error: uninitialized symbol 'data'.
fs/btrfs/volumes.c:7415 btrfs_dev_stats_value() error: uninitialized symbol 'val'.
Fix those warnings by reverting back to the old memset() behavior.
By this we keep the static checker happy and would still make a lot of
noise when such invalid ranges are passed in.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: f98b6215d7d1 ("btrfs: extent_io: do extra check for extent buffer read write functions")
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 6954ae763b86f4..caccd0376342b7 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3995,8 +3995,14 @@ void read_extent_buffer(const struct extent_buffer *eb, void *dstv, char *dst = (char *)dstv; unsigned long i = get_eb_page_index(start); - if (check_eb_range(eb, start, len)) + if (check_eb_range(eb, start, len)) { + /* + * Invalid range hit, reset the memory, so callers won't get + * some random garbage for their uninitialzed memory. + */ + memset(dstv, 0, len); return; + } offset = get_eb_offset_in_page(eb, start); |