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wolfSSL_X509_get_ext_by_OBJ: check we don't deref a NULL ptr #9358

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wolfSSL_X509_get_ext_by_OBJ: check we don't deref a NULL ptr #9358

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8 changes: 5 additions & 3 deletions src/x509.c
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Original file line number Diff line number Diff line change
Expand Up @@ -463,10 +463,12 @@ int wolfSSL_X509_get_ext_by_OBJ(const WOLFSSL_X509 *x,
lastpos++;
if (lastpos < 0)
lastpos = 0;
for (; lastpos < wolfSSL_sk_num(sk); lastpos++)
if (wolfSSL_OBJ_cmp(wolfSSL_sk_X509_EXTENSION_value(sk,
lastpos)->obj, obj) == 0)
for (; lastpos < wolfSSL_sk_num(sk); lastpos++) {
WOLFSSL_X509_EXTENSION* ext = wolfSSL_sk_X509_EXTENSION_value(sk,
lastpos);
if (ext != NULL && wolfSSL_OBJ_cmp(ext->obj, obj) == 0)
return lastpos;
}
return WOLFSSL_FATAL_ERROR;
}

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