diff options
| author | Todd Kjos <tkjos@android.com> | 2019-12-13 12:25:31 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-17 19:55:33 +0100 |
| commit | 34d8a89fe156b082823f438f8240e8d57291c9f2 (patch) | |
| tree | 69036a6aa87ee378ead1f2fc40f3447b043b5851 /drivers/android | |
| parent | a348e30570f8986952e378d62d699001840483ab (diff) | |
| download | linux-34d8a89fe156b082823f438f8240e8d57291c9f2.tar.gz linux-34d8a89fe156b082823f438f8240e8d57291c9f2.tar.bz2 linux-34d8a89fe156b082823f438f8240e8d57291c9f2.zip | |
binder: fix incorrect calculation for num_valid
commit 16981742717b04644a41052570fb502682a315d2 upstream.
For BINDER_TYPE_PTR and BINDER_TYPE_FDA transactions, the
num_valid local was calculated incorrectly causing the
range check in binder_validate_ptr() to miss out-of-bounds
offsets.
Fixes: bde4a19fc04f ("binder: use userspace pointer as base of buffer space")
Signed-off-by: Todd Kjos <tkjos@google.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191213202531.55010-1-tkjos@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android')
| -rw-r--r-- | drivers/android/binder.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 265d9dd46a5e..976a69420c16 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3314,7 +3314,7 @@ static void binder_transaction(struct binder_proc *proc, binder_size_t parent_offset; struct binder_fd_array_object *fda = to_binder_fd_array_object(hdr); - size_t num_valid = (buffer_offset - off_start_offset) * + size_t num_valid = (buffer_offset - off_start_offset) / sizeof(binder_size_t); struct binder_buffer_object *parent = binder_validate_ptr(target_proc, t->buffer, @@ -3388,7 +3388,7 @@ static void binder_transaction(struct binder_proc *proc, t->buffer->user_data + sg_buf_offset; sg_buf_offset += ALIGN(bp->length, sizeof(u64)); - num_valid = (buffer_offset - off_start_offset) * + num_valid = (buffer_offset - off_start_offset) / sizeof(binder_size_t); ret = binder_fixup_parent(t, thread, bp, off_start_offset, |