media: venus: Add a check for packet size after reading from shared memory

commit 49befc830daa743e051a65468c05c2ff9e8580e6 upstream.

Add a check to ensure that the packet size does not exceed the number of
available words after reading the packet header from shared memory. This
ensures that the size provided by the firmware is safe to process and
prevent potential out-of-bounds memory access.

Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files")
Cc: stable@vger.kernel.org
Signed-off-by: Vedang Nagar <quic_vnagar@quicinc.com>
Co-developed-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index c753756108dc04299550d85e6cdac6164b418198..5ae83eb66aa3650fddd3571ef9a9dbe7f7d36f17 100644 (file)
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -239,6 +239,7 @@ static int venus_write_queue(struct venus_hfi_device *hdev,
 static int venus_read_queue(struct venus_hfi_device *hdev,
                            struct iface_queue *queue, void *pkt, u32 *tx_req)
 {
+       struct hfi_pkt_hdr *pkt_hdr = NULL;
        struct hfi_queue_header *qhdr;
        u32 dwords, new_rd_idx;
        u32 rd_idx, wr_idx, type, qsize;
@@ -304,6 +305,9 @@ static int venus_read_queue(struct venus_hfi_device *hdev,
                        memcpy(pkt, rd_ptr, len);
                        memcpy(pkt + len, queue->qmem.kva, new_rd_idx << 2);
                }
+               pkt_hdr = (struct hfi_pkt_hdr *)(pkt);
+               if ((pkt_hdr->size >> 2) != dwords)
+                       return -EINVAL;
        } else {
                /* bad packet received, dropping */
                new_rd_idx = qhdr->write_idx;