From: Hans Verkuil hverkuil@xs4all.nl
commit d65842f7126aa1a87fb44b7c9980c12630ed4f33 upstream.
Calling VIDIOC_DQBUF can release the core serialization lock pointed to by vb2_queue->lock if it has to wait for a new buffer to arrive.
However, if userspace dup()ped the video device filehandle, then it is possible to read or call DQBUF from two filehandles at the same time.
It is also possible to call REQBUFS from one filehandle while the other is waiting for a buffer. This will remove all the buffers and reallocate new ones. Removing all the buffers isn't the problem here (that's already handled correctly by DQBUF), but the reallocating part is: DQBUF isn't aware that the buffers have changed.
This is fixed by setting a flag whenever the lock is released while waiting for a buffer to arrive. And checking the flag where needed so we can return -EBUSY.
Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Reported-by: Syzbot syzbot+4180ff9ca6810b06c1e9@syzkaller.appspotmail.com Reviewed-by: Tomasz Figa tfiga@chromium.org Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/common/videobuf2/videobuf2-core.c | 22 ++++++++++++++++++++++ include/media/videobuf2-core.h | 1 + 2 files changed, 23 insertions(+)
--- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -672,6 +672,11 @@ int vb2_core_reqbufs(struct vb2_queue *q return -EBUSY; }
+ if (q->waiting_in_dqbuf && *count) { + dprintk(1, "another dup()ped fd is waiting for a buffer\n"); + return -EBUSY; + } + if (*count == 0 || q->num_buffers != 0 || (q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory)) { /* @@ -807,6 +812,10 @@ int vb2_core_create_bufs(struct vb2_queu }
if (!q->num_buffers) { + if (q->waiting_in_dqbuf && *count) { + dprintk(1, "another dup()ped fd is waiting for a buffer\n"); + return -EBUSY; + } memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); q->memory = memory; q->waiting_for_buffers = !q->is_output; @@ -1659,6 +1668,11 @@ static int __vb2_wait_for_done_vb(struct for (;;) { int ret;
+ if (q->waiting_in_dqbuf) { + dprintk(1, "another dup()ped fd is waiting for a buffer\n"); + return -EBUSY; + } + if (!q->streaming) { dprintk(1, "streaming off, will not wait for buffers\n"); return -EINVAL; @@ -1686,6 +1700,7 @@ static int __vb2_wait_for_done_vb(struct return -EAGAIN; }
+ q->waiting_in_dqbuf = 1; /* * We are streaming and blocking, wait for another buffer to * become ready or for streamoff. Driver's lock is released to @@ -1706,6 +1721,7 @@ static int __vb2_wait_for_done_vb(struct * the locks or return an error if one occurred. */ call_void_qop(q, wait_finish, q); + q->waiting_in_dqbuf = 0; if (ret) { dprintk(1, "sleep was interrupted\n"); return ret; @@ -2585,6 +2601,12 @@ static size_t __vb2_perform_fileio(struc if (!data) return -EINVAL;
+ if (q->waiting_in_dqbuf) { + dprintk(3, "another dup()ped fd is %s\n", + read ? "reading" : "writing"); + return -EBUSY; + } + /* * Initialize emulator on first call. */ --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -595,6 +595,7 @@ struct vb2_queue { unsigned int start_streaming_called:1; unsigned int error:1; unsigned int waiting_for_buffers:1; + unsigned int waiting_in_dqbuf:1; unsigned int is_multiplanar:1; unsigned int is_output:1; unsigned int copy_timestamp:1;