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| author | Alexander Potapenko <glider@google.com> | 2023-01-24 12:32:34 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-14 19:11:40 +0100 |
| commit | 8ab575add354e48126591606262446fa1ee7ebd4 (patch) | |
| tree | c0d14d04ceeefe3cdb1921179ef803ab5a1a5665 | |
| parent | 66cf3a8273abcac9c52b088f87f926e1a699d959 (diff) | |
| download | linux-8ab575add354e48126591606262446fa1ee7ebd4.tar.gz | |
btrfs: zlib: zero-initialize zlib workspace
commit eadd7deca0ad8a83edb2b894d8326c78e78635d6 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 b4f44662cda7..94d06a76edb1 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; /* |