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Avoid segfault in hash update with corrupted decrypt data.

This commit is contained in:
Kees Cook 2005-05-16 09:15:24 +00:00 committed by Alexandre Julliard
parent 3cf8d37067
commit 0cdc0479b8
1 changed files with 6 additions and 2 deletions
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8
dlls/rsaenh/rsaenh.c
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@ -1929,6 +1929,7 @@ BOOL WINAPI RSAENH_CPDecrypt(HCRYPTPROV hProv, HCRYPTKEY hKey, HCRYPTHASH hHash,
CRYPTKEY *pCryptKey;
BYTE *in, out[RSAENH_MAX_BLOCK_SIZE], o[RSAENH_MAX_BLOCK_SIZE];
DWORD i, j, k;
DWORD dwMax;
TRACE("(hProv=%08lx, hKey=%08lx, hHash=%08lx, Final=%d, dwFlags=%08lx, pbData=%p, "
"pdwDataLen=%p)\n", hProv, hKey, hHash, Final, dwFlags, pbData, pdwDataLen);
@ -1959,7 +1960,9 @@ BOOL WINAPI RSAENH_CPDecrypt(HCRYPTPROV hProv, HCRYPTKEY hKey, HCRYPTHASH hHash,
SetLastError(NTE_BAD_DATA);
return FALSE;
}
dwMax=*pdwDataLen;
if (GET_ALG_TYPE(pCryptKey->aiAlgid) == ALG_TYPE_BLOCK) {
for (i=0, in=pbData; i<*pdwDataLen; i+=pCryptKey->dwBlockLen, in+=pCryptKey->dwBlockLen) {
switch (pCryptKey->dwMode) {
@ -2012,7 +2015,8 @@ BOOL WINAPI RSAENH_CPDecrypt(HCRYPTPROV hProv, HCRYPTKEY hKey, HCRYPTHASH hHash,
if (Final) setup_key(pCryptKey);
if (is_valid_handle(&handle_table, hHash, RSAENH_MAGIC_HASH)) {
if (!RSAENH_CPHashData(hProv, hHash, pbData, *pdwDataLen, 0)) return FALSE;
if (*pdwDataLen>dwMax ||
!RSAENH_CPHashData(hProv, hHash, pbData, *pdwDataLen, 0)) return FALSE;
}
return TRUE;