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| author | Mateusz Jurczyk <mjurczyk@google.com> | 2017-06-07 12:26:49 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2017-06-09 11:16:22 +0200 |
| commit | 68227c03cba84a24faf8a7277d2b1a03c8959c2c (patch) | |
| tree | 3f477053fd341d1a14da8b1e9408bdd2559c6c03 /fs | |
| parent | 2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff) | |
| download | linux-68227c03cba84a24faf8a7277d2b1a03c8959c2c.tar.gz linux-68227c03cba84a24faf8a7277d2b1a03c8959c2c.tar.bz2 linux-68227c03cba84a24faf8a7277d2b1a03c8959c2c.zip | |
fuse: initialize the flock flag in fuse_file on allocation
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/fuse/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 3ee4fdc3da9e..76eac2a554c4 100644 --- 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; |