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hcrypto: w32crypto crypt provider handle leak

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_hc_CryptProvider() returns a global handle to a Win32 Crypt Provider.
If the global handle is NULL, then a handle is allocated.  Unfortunately,
due to a coding mistake the global handle variable, g_cryptprovider, was
never set and a new handle was allocated with each call.

Refactor the function to ensure that the global handle is the value
that is returned.  Use NULL instead of 0 for pointer assignment.

Change-Id: If1ef3aa19cbd1d51860370db24c086e86922ff0d
This commit is contained in:
Jeffrey Altman
2014-12-24 15:43:03 -05:00
parent 0e93a04c01
commit b3f29170a3
1 changed files with 8 additions and 8 deletions
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16
lib/hcrypto/rand-w32.c
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@@ -43,16 +43,16 @@
#include "randi.h"
volatile static HCRYPTPROV g_cryptprovider = 0;
volatile static HCRYPTPROV g_cryptprovider = NULL;
static HCRYPTPROV
_hc_CryptProvider(void)
{
BOOL rv;
HCRYPTPROV cryptprovider = 0;
HCRYPTPROV cryptprovider = NULL;
if (g_cryptprovider != 0)
return g_cryptprovider;
if (g_cryptprovider != NULL)
goto out;
rv = CryptAcquireContext(&cryptprovider, NULL,
MS_ENHANCED_PROV, PROV_RSA_FULL,
@@ -82,15 +82,15 @@ _hc_CryptProvider(void)
CRYPT_VERIFYCONTEXT);
}
if (rv &&
if (rv == 0 &&
InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
(PVOID) cryptprovider, 0) != 0) {
(PVOID) cryptprovider, NULL) != 0) {
CryptReleaseContext(cryptprovider, 0);
cryptprovider = g_cryptprovider;
}
return cryptprovider;
out:
return g_cryptprovider;
}
/*