FROMGIT: media: venus: hfi: add check to handle incorrect queue size

commit 8f69275bc08b12156af609fcf77e35b60a462c93("media: venus: hfi: add check to handle incorrect queue size")

qsize represents size of shared queued between driver and video
firmware. Firmware can modify this value to an invalid large value. In
such situation, empty_space will be bigger than the space actually
available. Since new_wr_idx is not checked, so the following code will
result in an OOB write.
...
qsize = qhdr->q_size

if (wr_idx >= rd_idx)
 empty_space = qsize - (wr_idx - rd_idx)
....
if (new_wr_idx < qsize) {
 memcpy(wr_ptr, packet, dwords << 2) --> OOB write

Add check to ensure qsize is within the allocated size while
reading and writing packets into the queue.

Cc: stable@vger.kernel.org
Fixes: d96d3f30 ("[media] media: venus: hfi: add Venus HFI files")
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
CRs-Fixed: 3935673
Change-Id: Ifb907d4a4c82f853081492e06e68180476367ed5
Git-commit: 69baf245
Git-repo: https://gitlab.freedesktop.org/linux-media/media-committers.git


Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Vasantha Balla <quic_c_vballa@quicinc.com>