[FFmpeg-devel] [PATCH 1/2] avcodec/decode: Fix member access within null pointer

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

This "works" because the public AVCodecHWConfig is at the beginning of
AVCodecHWConfigInternal.

Fixes libavcodec/decode.c:1035:61: runtime error: member access within
null pointer of type 'const struct AVCodecHWConfigInternal'.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/decode.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index 791940648d..cdb682cf69 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -1023,6 +1023,7 @@ enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *avctx,
                                               const enum AVPixelFormat *fmt)
 {
     const AVPixFmtDescriptor *desc;
+    const FFCodec *const codec = ffcodec(avctx->codec);
     const AVCodecHWConfig *config;
     int i, n;
 
@@ -1031,10 +1032,8 @@ enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *avctx,
     if (avctx->hw_device_ctx && ffcodec(avctx->codec)->hw_configs) {
         AVHWDeviceContext *device_ctx =
             (AVHWDeviceContext*)avctx->hw_device_ctx->data;
-        for (i = 0;; i++) {
-            config = &ffcodec(avctx->codec)->hw_configs[i]->public;
-            if (!config)
-                break;
+        for (size_t i = 0; codec->hw_configs[i]; i++) {
+            config = &codec->hw_configs[i]->public;
             if (!(config->methods &
                   AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
                 continue;
-- 
2.40.1

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