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

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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: d96d3f30c0 ("[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>
This commit is contained in:
Vikash Garodia
2025-02-20 22:50:10 +05:30
committed by Greg Kroah-Hartman
parent 5af611c70f
commit 40084302f6
1 changed files with 6 additions and 0 deletions
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6
drivers/media/platform/qcom/venus/hfi_venus.c
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@@ -187,6 +187,9 @@ static int venus_write_queue(struct venus_hfi_device *hdev,
/* 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
@@ -255,6 +258,9 @@ static int venus_read_queue(struct venus_hfi_device *hdev,
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();