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Factor one more occurrence of code into function

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This may look like a behaviour change because one check has been added to the
function that was previously done in only one of the 3 call sites. However it
is not, because:
- for the 2 call sites in verify(), the test always succeeds as path_cnt is 0.
- for the call site in verify_child(), the same test was done later anyway in
  verify_top()
This commit is contained in:
Manuel Pégourié-Gonnard 2017-06-29 12:38:42 +02:00
parent 2f1c33dc33
commit 9c6118c498
1 changed files with 10 additions and 19 deletions
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29
library/x509_crt.c
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@ -1904,13 +1904,18 @@ static mbedtls_x509_crt *x509_crt_find_parent( mbedtls_x509_crt *child,
{
mbedtls_x509_crt *parent;
(void) self_cnt;
for( parent = candidates; parent != NULL; parent = parent->next )
{
if( x509_crt_check_parent( child, parent, top, path_cnt == 0 ) != 0 )
continue;
/* +1 because stored max_pathlen is 1 higher that the actual value */
if( parent->max_pathlen > 0 &&
parent->max_pathlen < 1 + path_cnt - self_cnt )
{
continue;
}
break;
}
@ -2158,23 +2163,9 @@ static int x509_crt_verify_child(
else
{
/* Look for a grandparent upwards the chain */
for( grandparent = parent->next;
grandparent != NULL;
grandparent = grandparent->next )
{
/* +2 because the current step is not yet accounted for
* and because max_pathlen is one higher than it should be.
* Also self signed certificates do not count to the limit. */
if( grandparent->max_pathlen > 0 &&
grandparent->max_pathlen < 2 + path_cnt - self_cnt )
{
continue;
}
if( x509_crt_check_parent( parent, grandparent,
0, path_cnt == 0 ) == 0 )
break;
}
/* path_cnt +1 because current step is not yet accounted for */
grandparent = x509_crt_find_parent( parent, parent->next, 0,
path_cnt + 1, self_cnt );
/* Is our parent part of the chain or at the top? */
if( grandparent != NULL )