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 8b1375c97c81f45fed3a090ee18eaa82dcbb18e4..b47c24cdde13e9577fa2128b90bba335845db265 100644 (file)
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -978,18 +978,26 @@ 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);
 }