[ffmpeg][goav][issues] goav Dictionary crash double free

傷城~ 2023-06-12 04:17 1阅读 0赞

### \[ffmpeg\]\[goav\]\[issues\] goav Dictionary crash double free ###

用goav 配置avoption时的一个bug  
github.com/giorgisio/goav/issues/57

code :

var dict *avutil.Dictionary = &avutil.Dictionary{
        }
    	er := dict.AvDictSet("profile", "main", 0)
    	if er < 0 {
        
    		log.Critical("AvDictSet failed")
    		return 
    	}
    	er = dict.AvDictSet("level", "51", 0)
    	if er < 0 {
        
    		log.Critical("AvDictSet failed")
    		return 
    	}
    	fmt.Println(dict.AvDictCount())
    	fmt.Println(dict.AvDictGet("profile", nil, 0))
    	fmt.Println(dict.AvDictGet("level", nil, 0))
    
    	err = context_enc.AvcodecOpen2(codec_enc, (**avcodec.Dictionary)(unsafe.Pointer(&dict)))
    	if err < 0 {
        
    		log.Critical("AvcodecOpen2 failed.")
    		return
    	}

double free or corruption (out)  
SIGABRT: abort  
PC=0x7f3a6082aed7 m=0 sigcode=18446744073709551610

goroutine 0 \[idle\]:  
runtime: unknown pc 0x7f3a6082aed7  
stack: frame=\{sp:0x7fff8f1abb70, fp:0x0\} stack=\[0x7fff8e9ad228,0x7fff8f1ac250)  
00007fff8f1aba70: 0000000000000000 000000000227fbc0  
00007fff8f1aba80: 00000000ffffffff 00007fff8f1abae8  
00007fff8f1aba90: 00007f3a60cc3030 00007f3a623509f0  
00007fff8f1abaa0: 00007f3a60cc5c25 0000000000000017

根本原因应该是没有dict.h里面没有AVDictionary的定义,添加一个alloc函数可以解决这个问题。  
![(./1572499802638.png)\]][._1572499802638.png]  
![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-mnQ0gC6z-1572500193455)(./1572500171616.png)\]][img-mnQ0gC6z-1572500193455_._1572500171616.png]

然后这样分配dict空间:

var dict *avutil.Dictionary = avutil.AvDictAlloc()
    	er := dict.AvDictSet("profile", "constrained_baseline", 0)
    	if er < 0 {
        
    		log.Critical("AvDictSet failed")
    		return 
    	}
    	er = dict.AvDictSet("level", "52", 0)
    	if er < 0 {
        
    		log.Critical("AvDictSet failed")
    		return 
    	}
    
    	fmt.Println(dict.AvDictCount())
    	//fmt.Println(dict.AvDictGet("profile", nil, 0))
    	//fmt.Println(dict.AvDictGet("level", nil, 0))
    	//dict.AvDictFree()
    
    	err = context_enc.AvcodecOpen2(codec_enc, (**avcodec.Dictionary)(unsafe.Pointer(&dict)))
    	if err < 0 {
        
    		log.Critical("AvcodecOpen2 failed.")
    		return
    	}
    	fmt.Println(dict.AvDictCount())

[._1572499802638.png]: /images/20230531/a9d14f2772124b678e97ae83241b000f.png
[img-mnQ0gC6z-1572500193455_._1572500171616.png]: /images/20230531/b6c6934fc43b43aeaaed07d15398329f.png