On 2017/4/30 20:47, Mark Thompson wrote:
> On 26/04/17 07:44, Jun Zhao wrote:
>> From f3678e0ceb691b6df5957a2c3d26d4f0d91d4ff5 Mon Sep 17 00:00:00 2001
>> From: Jun Zhao <jun.z...@intel.com>
>> Date: Wed, 26 Apr 2017 14:00:56 +0800
>> Subject: [PATCH] lavc/vaapi_encode_h265: Suppress the "above array bounds"
>> warning.
>> MIME-Version: 1.0
>> Content-Type: text/plain; charset=UTF-8
>> Content-Transfer-Encoding: 8bit
>>
>> setting the layer_id_included_flag lead to a potential array out of bounds,
>> build warning message as follow:
>> libavcodec/vaapi_encode_h265.c: In function
>> ‘vaapi_encode_h265_write_sequence_header’:
>> libavcodec/vaapi_encode_h265.c:305:49: warning: array subscript is above
>> array bounds [-Warray-bounds]
>
> Can you explain what the aim of this is? You haven't actually set any of the
> layer_id_included_flag in this patch, so is there more to follow dealing with
> the layers / layer sets?
>
> In any case, the dimensions of the array should probably be
> [MAX_LAYER_SETS][MAX_LAYERS] rather than the current values. (With
> MAX_LAYER_SETS having value 1 currently, but more if you intend to add more.)
Because in vaapi_encode_h265_write_vps(), when setting the
layer_id_included_flag, the index i start from 1, it's a potential above array
bounds issue when MAX_LAYERS == 1.
>
>> Signed-off-by: Jun Zhao <jun.z...@intel.com>
>> ---
>> libavcodec/vaapi_encode_h265.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/vaapi_encode_h265.c b/libavcodec/vaapi_encode_h265.c
>> index 6e008b7b9c..1b2a49806b 100644
>> --- a/libavcodec/vaapi_encode_h265.c
>> +++ b/libavcodec/vaapi_encode_h265.c
>> @@ -66,7 +66,7 @@ typedef struct VAAPIEncodeH265MiscSequenceParams {
>> unsigned int vps_num_layer_sets_minus1;
>> unsigned int sps_max_sub_layers_minus1;
>> char sps_temporal_id_nesting_flag;
>> - char layer_id_included_flag[MAX_LAYERS][64];
>> + char layer_id_included_flag[MAX_LAYERS+1][64];
>>
>> // Profile/tier/level parameters.
>> char general_profile_compatibility_flag[32];
>> --
>> 2.11.0
>>
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