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Heap corruption in win32 compiled by VC

July 13, 2011 01:36AM
I checkout the newest code from svn and compiled it by vc, but an exception occurred. So I modified cl option to -MTd compiled again.
The windbg shows that CheckBytes function return false when calling ngx_free() at ngx_shmem.c:43.

I think that ngx_sprintf must put more than name's alloc size bytes into name, So I use ngx_snprintf to replace ngx_sprintf. The problem disappeared. Is it useful?

name = ngx_alloc(shm->name.len + 2 + sizeof(NGX_INT32_LEN), shm->log);
if (name == NULL) {
return NGX_ERROR;

- (void) ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique);
+ (void) ngx_snprintf(name, shm->name.len + 2 + sizeof(NGX_INT32_LEN),
+ "%V_%s%Z", &shm->name, ngx_unique);
Subject Author Posted

Heap corruption in win32 compiled by VC

bigplum July 13, 2011 01:36AM

Re: Heap corruption in win32 compiled by VC

Maxim Dounin July 13, 2011 07:00AM

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