upstream/bind9
1
0
Fork 0
mirror of https://github.com/isc-projects/bind9.git synced 2026-03-06 23:40:25 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

Don't perform arithmetic on NULL pointers

Browse source 
When node is NULL when calling getparent() et al. they return NULL
but performing arithmetic on the NULL pointer is undefined.  Check
if 'node' or 'header' is NULL and skip the adjustment.
This commit is contained in:
Mark Andrews 2023-01-10 17:15:09 +11:00
parent 802f700d5a
commit 2a9300a3bc
1 changed files with 14 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
lib/dns/rbt.c
View file

@ -168,6 +168,10 @@ serialize_nodes(FILE *file, dns_rbtnode_t *node, uintptr_t parent,
dns_rbtdatawriter_t datawriter, void *writer_arg,
uintptr_t *where, uint64_t *crc);
#define ADJUST_ADDRESS(address, relative, header) \
if (address != NULL && header != NULL) { \
address += relative * (uintptr_t)header; \
}
/*
* The following functions allow you to get the actual address of a pointer
* without having to use an if statement to check to see if that address is
@ -176,7 +180,8 @@ serialize_nodes(FILE *file, dns_rbtnode_t *node, uintptr_t parent,
static dns_rbtnode_t *
getparent(dns_rbtnode_t *node, file_header_t *header) {
char *adjusted_address = (char *)(node->parent);
adjusted_address += node->parent_is_relative * (uintptr_t)header;
ADJUST_ADDRESS(adjusted_address, node->parent_is_relative, header);
return ((dns_rbtnode_t *)adjusted_address);
}
@ -184,7 +189,8 @@ getparent(dns_rbtnode_t *node, file_header_t *header) {
static dns_rbtnode_t *
getleft(dns_rbtnode_t *node, file_header_t *header) {
char *adjusted_address = (char *)(node->left);
adjusted_address += node->left_is_relative * (uintptr_t)header;
ADJUST_ADDRESS(adjusted_address, node->left_is_relative, header);
return ((dns_rbtnode_t *)adjusted_address);
}
@ -192,7 +198,8 @@ getleft(dns_rbtnode_t *node, file_header_t *header) {
static dns_rbtnode_t *
getright(dns_rbtnode_t *node, file_header_t *header) {
char *adjusted_address = (char *)(node->right);
adjusted_address += node->right_is_relative * (uintptr_t)header;
ADJUST_ADDRESS(adjusted_address, node->right_is_relative, header);
return ((dns_rbtnode_t *)adjusted_address);
}
@ -200,7 +207,8 @@ getright(dns_rbtnode_t *node, file_header_t *header) {
static dns_rbtnode_t *
getdown(dns_rbtnode_t *node, file_header_t *header) {
char *adjusted_address = (char *)(node->down);
adjusted_address += node->down_is_relative * (uintptr_t)header;
ADJUST_ADDRESS(adjusted_address, node->down_is_relative, header);
return ((dns_rbtnode_t *)adjusted_address);
}
@ -208,7 +216,8 @@ getdown(dns_rbtnode_t *node, file_header_t *header) {
static dns_rbtnode_t *
getdata(dns_rbtnode_t *node, file_header_t *header) {
char *adjusted_address = (char *)(node->data);
adjusted_address += node->data_is_relative * (uintptr_t)header;
ADJUST_ADDRESS(adjusted_address, node->data_is_relative, header);
return ((dns_rbtnode_t *)adjusted_address);
}