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Fix X509_NAME decode for malloc failures. 

The original X509_NAME decode free code was buggy: this
could result in double free or leaks if a malloc failure
occurred.

Simplify and fix the logic.

Thanks to Guido Vranken for reporting this issue.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1691)
This commit is contained in:
Dr. Stephen Henson 2016-10-02 15:21:29 +01:00
parent bf78883d45
commit 6dcba070a9
1 changed files with 20 additions and 17 deletions
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37
crypto/x509/x_name.c
View File

@ -125,6 +125,11 @@ static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
*pval = NULL;
}
static void name_entry_stack_free(STACK_OF(X509_NAME_ENTRY) *ents)
{
sk_X509_NAME_ENTRY_pop_free(ents, X509_NAME_ENTRY_free);
}
static int x509_name_ex_d2i(ASN1_VALUE **val,
const unsigned char **in, long len,
const ASN1_ITEM *it, int tag, int aclass,
@ -173,25 +178,16 @@ static int x509_name_ex_d2i(ASN1_VALUE **val,
for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
entry = sk_X509_NAME_ENTRY_value(entries, j);
entry->set = i;
if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry)) {
/*
* Free all in entries if sk_X509_NAME_ENTRY_push return failure.
* X509_NAME_ENTRY_free will check the null entry.
*/
sk_X509_NAME_ENTRY_pop_free(entries, X509_NAME_ENTRY_free);
if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
goto err;
}
/*
* If sk_X509_NAME_ENTRY_push return success, clean the entries[j].
* It's necessary when 'goto err;' happens.
*/
sk_X509_NAME_ENTRY_set(entries, j, NULL);
}
sk_X509_NAME_ENTRY_free(entries);
sk_STACK_OF_X509_NAME_ENTRY_set(intname.s, i, NULL);
}
sk_STACK_OF_X509_NAME_ENTRY_free(intname.s);
/*
* All entries have now been pushed to nm->x.entries
* free up the stacks in intname.s but not the entries
* themselves.
*/
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, sk_X509_NAME_ENTRY_free);
intname.s = NULL;
ret = x509_name_canon(nm.x);
if (!ret)
@ -202,8 +198,15 @@ static int x509_name_ex_d2i(ASN1_VALUE **val,
return ret;
err:
/* If intname.s is not NULL only some entries exist in nm->x.entries:
* zero references in nm->x.entries list. Since all entries exist
* in intname.s we can free them all there
*/
if (intname.s != NULL) {
sk_X509_NAME_ENTRY_zero(nm.x->entries);
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, name_entry_stack_free);
}
X509_NAME_free(nm.x);
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s, sk_X509_NAME_ENTRY_free);
ASN1err(ASN1_F_X509_NAME_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
return 0;
}