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curlx: limit use of system allocators to the minimum possible

Browse source 
Clone a multibye conversion function into curlx/fopen, and use that
local copy from curlx/fopen functions. Adjust allocators in curlx/fopen
to use curl's in normal builds, and system allocators in TrackMemory
builds to avoid recursion.

This allows to switch curlx/multibyte functions to curl allocators in
all configurations, as they are no longer called by curlx/fopen, and
a recursive call can no longer happen.

After this patch the system allocator is only used in TrackMemory
Windows builds, within curlx `fopen`, `freopen`, `stat` and `open`
functions.

Also:
- test 1, 440, 767: raise allocation limitsto fit the extra allocations
  in Windows Unicode builds.
- replace all uses of `curlx_unicodefree()` macro with `curlx_free()`
  across the codebase.
- curlx/multibyte: delete `curlx_unicodefree()`.
- ldap: join Windows and non-Windows codepaths that became
  identical after moving from `curlx_unicodefree()` to `curlx_free()`.
- vauth: drop a strdup from standard to curl allocator since
  the original allocation is now already done by curl's.
- tool_doswin: drop now superfluous strdup from `FindWin32CACert()`.
- memanalyzer.pm: sync weirdo `calloc` log message with `malloc`'s.

Fixes #19748
Closes #19845
This commit is contained in:
Viktor Szakats 2025-12-04 23:54:25 +01:00
parent 2d6ade19fc
commit 4e051ff550
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GPG key ID: B5ABD165E2AEF201
19 changed files with 100 additions and 113 deletions
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12
lib/vauth/vauth.c
View file

@ -71,7 +71,6 @@ TCHAR *Curl_auth_build_spn(const char *service, const char *host,
{
char *utf8_spn = NULL;
TCHAR *tchar_spn = NULL;
TCHAR *dupe_tchar_spn = NULL;
(void)realm;
@ -87,16 +86,11 @@ TCHAR *Curl_auth_build_spn(const char *service, const char *host,
if(!utf8_spn)
return NULL;
/* Allocate and return a TCHAR based SPN. Since curlx_convert_UTF8_to_tchar
must be freed by curlx_unicodefree we will dupe the result so that the
pointer this function returns can be normally free'd. */
/* Allocate and return a TCHAR based SPN. */
tchar_spn = curlx_convert_UTF8_to_tchar(utf8_spn);
curlx_free(utf8_spn);
if(!tchar_spn)
return NULL;
dupe_tchar_spn = curlx_tcsdup(tchar_spn);
curlx_unicodefree(tchar_spn);
return dupe_tchar_spn;
return tchar_spn;
}
#endif /* USE_WINDOWS_SSPI */