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| author | Alexander Potapenko <glider@google.com> | 2023-01-24 12:32:34 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-01-25 20:11:08 +0100 |
| commit | eadd7deca0ad8a83edb2b894d8326c78e78635d6 (patch) | |
| tree | f3d82662280e14ea01344621901292fd3974c1b8 /fs | |
| parent | 3c538de0f2a74d50aff7278c092f88ae59cee688 (diff) | |
| download | linux-stable-eadd7deca0ad8a83edb2b894d8326c78e78635d6.tar.gz linux-stable-eadd7deca0ad8a83edb2b894d8326c78e78635d6.tar.bz2 linux-stable-eadd7deca0ad8a83edb2b894d8326c78e78635d6.zip | |
btrfs: zlib: zero-initialize zlib workspace
KMSAN reports uses of uninitialized memory in zlib's longest_match()
called on memory originating from zlib_alloc_workspace().
This issue is known by zlib maintainers and is claimed to be harmless,
but to be on the safe side we'd better initialize the memory.
Link: https://zlib.net/zlib_faq.html#faq36
Reported-by: syzbot+14d9e7602ebdf7ec0a60@syzkaller.appspotmail.com
CC: stable@vger.kernel.org # 5.4+
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/zlib.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c index 01a13de11832..da7bb9187b68 100644 --- a/fs/btrfs/zlib.c +++ b/fs/btrfs/zlib.c @@ -63,7 +63,7 @@ struct list_head *zlib_alloc_workspace(unsigned int level) workspacesize = max(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL), zlib_inflate_workspacesize()); - workspace->strm.workspace = kvmalloc(workspacesize, GFP_KERNEL); + workspace->strm.workspace = kvzalloc(workspacesize, GFP_KERNEL); workspace->level = level; workspace->buf = NULL; /* |