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media: venus: hfi: add checks to perform sanity on queue pointers

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Read and write pointers are used to track the packet index in the memory
shared between video driver and firmware. There is a possibility of OOB
access if the read or write pointer goes beyond the queue memory size.
Add checks for the read and write pointer to avoid OOB access.

Cc: stable@vger.kernel.org
Fixes: d96d3f30c0 ("[media] media: venus: hfi: add Venus HFI files")
Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Vikash Garodia 2023-08-10 07:55:01 +05:30 committed by Hans Verkuil
parent 48016737a9
commit 5e538fce33
1 changed files with 10 additions and 0 deletions
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10
drivers/media/platform/qcom/venus/hfi_venus.c
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@ -205,6 +205,11 @@ static int venus_write_queue(struct venus_hfi_device *hdev,
new_wr_idx = wr_idx + dwords;
wr_ptr = (u32 *)(queue->qmem.kva + (wr_idx << 2));
if (wr_ptr < (u32 *)queue->qmem.kva ||
wr_ptr > (u32 *)(queue->qmem.kva + queue->qmem.size - sizeof(*wr_ptr)))
return -EINVAL;
if (new_wr_idx < qsize) {
memcpy(wr_ptr, packet, dwords << 2);
} else {
@ -272,6 +277,11 @@ static int venus_read_queue(struct venus_hfi_device *hdev,
}
rd_ptr = (u32 *)(queue->qmem.kva + (rd_idx << 2));
if (rd_ptr < (u32 *)queue->qmem.kva ||
rd_ptr > (u32 *)(queue->qmem.kva + queue->qmem.size - sizeof(*rd_ptr)))
return -EINVAL;
dwords = *rd_ptr >> 2;
if (!dwords)
return -EINVAL;