fuse: initialize the flock flag in fuse_file on allocation

[ Upstream commit 68227c03cba84a24faf8a7277d2b1a03c8959c2c ]

Before the patch, the flock flag could remain uninitialized for the
lifespan of the fuse_file allocation. Unless set to true in
fuse_file_flock(), it would remain in an indeterminate state until read in
an if statement in fuse_release_common(). This could consequently lead to
taking an unexpected branch in the code.

The bug was discovered by a runtime instrumentation designed to detect use
of uninitialized memory in the kernel.

Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Fixes: 37fb3a30b462 ("fuse: fix flock")
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 1f03f0a36e355530ecd11273aae898b027f0e053..cacf95ac49fe273827deccd980284c5334e4ae02 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -46,7 +46,7 @@ struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
 {
        struct fuse_file *ff;
 
-       ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
+       ff = kzalloc(sizeof(struct fuse_file), GFP_KERNEL);
        if (unlikely(!ff))
                return NULL;