5.4-stable review patch. If anyone has any objections, please let me know.
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From: Vikash Garodia quic_vgarodia@quicinc.com
commit 69baf245b23e20efda0079238b27fc63ecf13de1 upstream.
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: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files") Reviewed-by: Bryan O'Donoghue bryan.odonoghue@linaro.org Signed-off-by: Vikash Garodia quic_vgarodia@quicinc.com Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/platform/qcom/venus/hfi_venus.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/media/platform/qcom/venus/hfi_venus.c +++ b/drivers/media/platform/qcom/venus/hfi_venus.c @@ -188,6 +188,9 @@ static int venus_write_queue(struct venu /* ensure rd/wr indices's are read from memory */ rmb();
+ if (qsize > IFACEQ_QUEUE_SIZE / 4) + return -EINVAL; + if (wr_idx >= rd_idx) empty_space = qsize - (wr_idx - rd_idx); else @@ -256,6 +259,9 @@ static int venus_read_queue(struct venus wr_idx = qhdr->write_idx; qsize = qhdr->q_size;
+ if (qsize > IFACEQ_QUEUE_SIZE / 4) + return -EINVAL; + /* make sure data is valid before using it */ rmb();