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fixed misuse of realloc

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if called with size 0, realloc frees the buffer, which may eventually
lead to a double free corruption.
This commit is contained in:
Frank Morgner
2019-01-17 15:04:35 +01:00
parent 3209ef2261
commit c63cc40c34
6 changed files with 44 additions and 32 deletions
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12
virtualsmartcard/win32/BixVReader/PipeReader.cpp
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@@ -93,12 +93,14 @@ bool PipeReader::QueryTransmit(BYTE *APDU,int APDUlen,BYTE **Resp,int *Resplen)
pipe=NULL;
return false;
}
BYTE *p=(BYTE *)realloc(*Resp, dwRespLen);
if (p==NULL) {
pipe=NULL;
return false;
if (0 != dwRespLen) {
BYTE *p=(BYTE *)realloc(*Resp, dwRespLen);
if (p==NULL) {
pipe=NULL;
return false;
}
*Resp=p;
}
*Resp=p;
if (!ReadFile(pipe,*Resp,dwRespLen,&read,NULL)) {
pipe=NULL;
return false;