diff mbox series

[4/4] venus: hfi_parser: Add check to keep the number of codecs within range

Message ID 1690432469-14803-5-git-send-email-quic_vgarodia@quicinc.com
State New
Headers
Series Venus driver fixes to avoid possible OOB accesses |

Commit Message

Vikash Garodia July 27, 2023, 4:34 a.m. UTC 
  Supported codec bitmask is populated from the payload from venus firmware.
There is a possible case when all the bits in the codec bitmask is set. In
such case, core cap for decoder is filled  and MAX_CODEC_NUM is utilized.
Now while filling the caps for encoder, it can lead to access the caps
array beyong 32 index. Hence leading to OOB write.
The fix counts the supported encoder and decoder. If the count is more than
max, then it skips accessing the caps.

Cc: stable@vger.kernel.org
Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parser")
Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
---
 drivers/media/platform/qcom/venus/hfi_parser.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Comments

Konrad Dybcio July 27, 2023, 5:11 p.m. UTC | #1 
On 27.07.2023 06:34, Vikash Garodia wrote:
> Supported codec bitmask is populated from the payload from venus firmware.
> There is a possible case when all the bits in the codec bitmask is set. In
> such case, core cap for decoder is filled  and MAX_CODEC_NUM is utilized.
> Now while filling the caps for encoder, it can lead to access the caps
> array beyong 32 index. Hence leading to OOB write.
> The fix counts the supported encoder and decoder. If the count is more than
> max, then it skips accessing the caps.
> 
> Cc: stable@vger.kernel.org
> Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parser")
> Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
> ---
>  drivers/media/platform/qcom/venus/hfi_parser.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media/platform/qcom/venus/hfi_parser.c
> index ec73cac..651e215 100644
> --- a/drivers/media/platform/qcom/venus/hfi_parser.c
> +++ b/drivers/media/platform/qcom/venus/hfi_parser.c
> @@ -14,11 +14,26 @@
>  typedef void (*func)(struct hfi_plat_caps *cap, const void *data,
>  		     unsigned int size);
>  
> +static int count_setbits(u32 input)
hweight_long()?

Konrad
diff mbox series

Patch

diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media/platform/qcom/venus/hfi_parser.c
index ec73cac..651e215 100644
--- a/drivers/media/platform/qcom/venus/hfi_parser.c
+++ b/drivers/media/platform/qcom/venus/hfi_parser.c
@@ -14,11 +14,26 @@ 
 typedef void (*func)(struct hfi_plat_caps *cap, const void *data,
 		     unsigned int size);
 
+static int count_setbits(u32 input)
+{
+	u32 count = 0;
+
+	while (input > 0) {
+		if ((input & 1) == 1)
+			count++;
+		input >>= 1;
+	}
+	return count;
+}
+
 static void init_codecs(struct venus_core *core)
 {
 	struct hfi_plat_caps *caps = core->caps, *cap;
 	unsigned long bit;
 
+	if ((count_setbits(core->dec_codecs) + count_setbits(core->enc_codecs)) > MAX_CODEC_NUM)
+		return;
+
 	for_each_set_bit(bit, &core->dec_codecs, MAX_CODEC_NUM) {
 		cap = &caps[core->codecs_count++];
 		cap->codec = BIT(bit);