media: venus: hfi: add a check to handle OOB in sfr region

commit f4b211714bcc70effa60c34d9fa613d182e3ef1e upstream.

sfr->buf_size is in shared memory and can be modified by malicious user.
OOB write is possible when the size is made higher than actual sfr data
buffer. Cap the size to allocated size for such cases.

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>

diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 306082e25943a241dda71d59cfec1a57d2368997..0b6cf86004fd829c879bc25a4e72070190f990d6 100644 (file)
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -970,18 +970,26 @@ static void venus_sfr_print(struct venus_hfi_device *hdev)
 {
        struct device *dev = hdev->core->dev;
        struct hfi_sfr *sfr = hdev->sfr.kva;
+       u32 size;
        void *p;
 
        if (!sfr)
                return;
 
-       p = memchr(sfr->data, '\0', sfr->buf_size);
+       size = sfr->buf_size;
+       if (!size)
+               return;
+
+       if (size > ALIGNED_SFR_SIZE)
+               size = ALIGNED_SFR_SIZE;
+
+       p = memchr(sfr->data, '\0', size);
        /*
         * SFR isn't guaranteed to be NULL terminated since SYS_ERROR indicates
         * that Venus is in the process of crashing.
         */
        if (!p)
-               sfr->data[sfr->buf_size - 1] = '\0';
+               sfr->data[size - 1] = '\0';
 
        dev_err_ratelimited(dev, "SFR message from FW: %s\n", sfr->data);
 }