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avcodec/cbs_h2645: Avoid function pointer casts, fix UB

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The SEI message read/write functions are called
via function pointers where the SEI message-specific
context is passed as void*. But the actual function
definitions use a pointer to their proper context
in place of void*, making the calls undefined behaviour.
Clang UBSan 17 warns about this.

This commit fixes this by adding wrapper functions
(created via macros) that have the right type that
call the actual functions. This reduced the number of failing
FATE tests with UBSan from 164 to 85 here.

Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-02-25 02:16:27 +01:00
parent b4b8b9ad5c
commit ab2173c0a5
6 changed files with 88 additions and 82 deletions
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15
libavcodec/cbs_h2645.c
View File

@ -235,6 +235,16 @@ static int cbs_h265_payload_extension_present(GetBitContext *gbc, uint32_t paylo
#define FUNC_H266(name) FUNC_NAME1(READWRITE, h266, name)
#define FUNC_SEI(name) FUNC_NAME1(READWRITE, sei, name)
#define SEI_FUNC(name, args) \
static int FUNC(name) args; \
static int FUNC(name ## _internal)(CodedBitstreamContext *ctx, \
RWContext *rw, void *cur, \
SEIMessageState *state) \
{ \
return FUNC(name)(ctx, rw, cur, state); \
} \
static int FUNC(name) args
#define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
#define u(width, name, range_min, range_max) \
@ -2070,6 +2080,11 @@ const CodedBitstreamType ff_cbs_type_h266 = {
.close = &cbs_h266_close,
};
// Macro for the read/write pair.
#define SEI_MESSAGE_RW(codec, name) \
.read = cbs_ ## codec ## _read_ ## name ## _internal, \
.write = cbs_ ## codec ## _write_ ## name ## _internal
static const SEIMessageTypeDescriptor cbs_sei_common_types[] = {
{
SEI_TYPE_FILLER_PAYLOAD,

35
libavcodec/cbs_h264_syntax_template.c
View File

@ -510,9 +510,9 @@ static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sei_buffering_period)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIBufferingPeriod *current,
SEIMessageState *sei)
SEI_FUNC(sei_buffering_period, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIBufferingPeriod *current,
SEIMessageState *sei))
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
@ -604,9 +604,8 @@ static int FUNC(sei_pic_timestamp)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sei_pic_timing)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPicTiming *current,
SEIMessageState *sei)
SEI_FUNC(sei_pic_timing, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPicTiming *current, SEIMessageState *sei))
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
@ -676,9 +675,9 @@ static int FUNC(sei_pic_timing)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sei_pan_scan_rect)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPanScanRect *current,
SEIMessageState *sei)
SEI_FUNC(sei_pan_scan_rect, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIPanScanRect *current,
SEIMessageState *sei))
{
int err, i;
@ -703,9 +702,9 @@ static int FUNC(sei_pan_scan_rect)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sei_recovery_point)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIRecoveryPoint *current,
SEIMessageState *sei)
SEI_FUNC(sei_recovery_point, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIRecoveryPoint *current,
SEIMessageState *sei))
{
int err;
@ -719,9 +718,9 @@ static int FUNC(sei_recovery_point)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(film_grain_characteristics)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawFilmGrainCharacteristics *current,
SEIMessageState *state)
SEI_FUNC(film_grain_characteristics, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawFilmGrainCharacteristics *current,
SEIMessageState *state))
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
const H264RawSPS *sps;
@ -802,9 +801,9 @@ static int FUNC(film_grain_characteristics)(CodedBitstreamContext *ctx, RWContex
return 0;
}
static int FUNC(sei_display_orientation)(CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIDisplayOrientation *current,
SEIMessageState *sei)
SEI_FUNC(sei_display_orientation, (CodedBitstreamContext *ctx, RWContext *rw,
H264RawSEIDisplayOrientation *current,
SEIMessageState *sei))
{
int err;

58
libavcodec/cbs_h265_syntax_template.c
View File

@ -1618,9 +1618,9 @@ static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sei_buffering_period)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIBufferingPeriod *current, SEIMessageState *sei)
SEI_FUNC(sei_buffering_period, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIBufferingPeriod *current,
SEIMessageState *sei))
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
const H265RawSPS *sps;
@ -1728,9 +1728,8 @@ static int FUNC(sei_buffering_period)
return 0;
}
static int FUNC(sei_pic_timing)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIPicTiming *current, SEIMessageState *sei)
SEI_FUNC(sei_pic_timing, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIPicTiming *current, SEIMessageState *sei))
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
const H265RawSPS *sps;
@ -1804,9 +1803,9 @@ static int FUNC(sei_pic_timing)
return 0;
}
static int FUNC(sei_pan_scan_rect)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIPanScanRect *current, SEIMessageState *sei)
SEI_FUNC(sei_pan_scan_rect, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIPanScanRect *current,
SEIMessageState *sei))
{
int err, i;
@ -1831,9 +1830,9 @@ static int FUNC(sei_pan_scan_rect)
return 0;
}
static int FUNC(sei_recovery_point)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIRecoveryPoint *current, SEIMessageState *sei)
SEI_FUNC(sei_recovery_point, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIRecoveryPoint *current,
SEIMessageState *sei))
{
int err;
@ -1847,9 +1846,9 @@ static int FUNC(sei_recovery_point)
return 0;
}
static int FUNC(film_grain_characteristics)(CodedBitstreamContext *ctx, RWContext *rw,
H265RawFilmGrainCharacteristics *current,
SEIMessageState *state)
SEI_FUNC(film_grain_characteristics, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawFilmGrainCharacteristics *current,
SEIMessageState *state))
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
const H265RawSPS *sps = h265->active_sps;
@ -1912,9 +1911,9 @@ static int FUNC(film_grain_characteristics)(CodedBitstreamContext *ctx, RWContex
return 0;
}
static int FUNC(sei_display_orientation)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIDisplayOrientation *current, SEIMessageState *sei)
SEI_FUNC(sei_display_orientation, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIDisplayOrientation *current,
SEIMessageState *sei))
{
int err;
@ -1931,9 +1930,9 @@ static int FUNC(sei_display_orientation)
return 0;
}
static int FUNC(sei_active_parameter_sets)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIActiveParameterSets *current, SEIMessageState *sei)
SEI_FUNC(sei_active_parameter_sets, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIActiveParameterSets *current,
SEIMessageState *sei))
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
const H265RawVPS *vps;
@ -1968,9 +1967,9 @@ static int FUNC(sei_active_parameter_sets)
return 0;
}
static int FUNC(sei_decoded_picture_hash)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIDecodedPictureHash *current, SEIMessageState *sei)
SEI_FUNC(sei_decoded_picture_hash, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIDecodedPictureHash *current,
SEIMessageState *sei))
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
const H265RawSPS *sps = h265->active_sps;
@ -2000,9 +1999,8 @@ static int FUNC(sei_decoded_picture_hash)
return 0;
}
static int FUNC(sei_time_code)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEITimeCode *current, SEIMessageState *sei)
SEI_FUNC(sei_time_code, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEITimeCode *current, SEIMessageState *sei))
{
int err, i;
@ -2051,9 +2049,9 @@ static int FUNC(sei_time_code)
return 0;
}
static int FUNC(sei_alpha_channel_info)
(CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIAlphaChannelInfo *current, SEIMessageState *sei)
SEI_FUNC(sei_alpha_channel_info, (CodedBitstreamContext *ctx, RWContext *rw,
H265RawSEIAlphaChannelInfo *current,
SEIMessageState *sei))
{
int err, length;

8
libavcodec/cbs_h266_syntax_template.c
View File

@ -3427,10 +3427,10 @@ static int FUNC(slice_header) (CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sei_decoded_picture_hash) (CodedBitstreamContext *ctx,
RWContext *rw,
H266RawSEIDecodedPictureHash *
current, SEIMessageState *unused)
SEI_FUNC(sei_decoded_picture_hash, (CodedBitstreamContext *ctx,
RWContext *rw,
H266RawSEIDecodedPictureHash *current,
SEIMessageState *unused))
{
int err, c_idx, i;

7
libavcodec/cbs_sei.h
View File

@ -126,13 +126,6 @@ typedef struct SEIMessageTypeDescriptor {
SEIMessageWriteFunction write;
} SEIMessageTypeDescriptor;
// Macro for the read/write pair. The clumsy cast is needed because the
// current pointer is typed in all of the read/write functions but has to
// be void here to fit all cases.
#define SEI_MESSAGE_RW(codec, name) \
.read = (SEIMessageReadFunction) cbs_ ## codec ## _read_ ## name, \
.write = (SEIMessageWriteFunction)cbs_ ## codec ## _write_ ## name
// End-of-list sentinel element.
#define SEI_MESSAGE_TYPE_END { .type = -1 }

47
libavcodec/cbs_sei_syntax_template.c
View File

@ -16,9 +16,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
static int FUNC(filler_payload)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawFillerPayload *current, SEIMessageState *state)
SEI_FUNC(filler_payload, (CodedBitstreamContext *ctx, RWContext *rw,
SEIRawFillerPayload *current,
SEIMessageState *state))
{
int err, i;
@ -34,9 +34,9 @@ static int FUNC(filler_payload)
return 0;
}
static int FUNC(user_data_registered)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawUserDataRegistered *current, SEIMessageState *state)
SEI_FUNC(user_data_registered, (CodedBitstreamContext *ctx, RWContext *rw,
SEIRawUserDataRegistered *current,
SEIMessageState *state))
{
int err, i, j;
@ -66,9 +66,9 @@ static int FUNC(user_data_registered)
return 0;
}
static int FUNC(user_data_unregistered)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawUserDataUnregistered *current, SEIMessageState *state)
SEI_FUNC(user_data_unregistered, (CodedBitstreamContext *ctx, RWContext *rw,
SEIRawUserDataUnregistered *current,
SEIMessageState *state))
{
int err, i;
@ -94,9 +94,10 @@ static int FUNC(user_data_unregistered)
return 0;
}
static int FUNC(mastering_display_colour_volume)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawMasteringDisplayColourVolume *current, SEIMessageState *state)
SEI_FUNC(mastering_display_colour_volume,
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawMasteringDisplayColourVolume *current,
SEIMessageState *state))
{
int err, c;
@ -116,9 +117,9 @@ static int FUNC(mastering_display_colour_volume)
return 0;
}
static int FUNC(content_light_level_info)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawContentLightLevelInfo *current, SEIMessageState *state)
SEI_FUNC(content_light_level_info, (CodedBitstreamContext *ctx, RWContext *rw,
SEIRawContentLightLevelInfo *current,
SEIMessageState *state))
{
int err;
@ -130,10 +131,10 @@ static int FUNC(content_light_level_info)
return 0;
}
static int FUNC(alternative_transfer_characteristics)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawAlternativeTransferCharacteristics *current,
SEIMessageState *state)
SEI_FUNC(alternative_transfer_characteristics,
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawAlternativeTransferCharacteristics *current,
SEIMessageState *state))
{
int err;
@ -144,10 +145,10 @@ static int FUNC(alternative_transfer_characteristics)
return 0;
}
static int FUNC(ambient_viewing_environment)
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawAmbientViewingEnvironment *current,
SEIMessageState *state)
SEI_FUNC(ambient_viewing_environment,
(CodedBitstreamContext *ctx, RWContext *rw,
SEIRawAmbientViewingEnvironment *current,
SEIMessageState *state))
{
static const uint16_t max_ambient_light_value = 50000;
int err;