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equipment: sanitize 'ws_info' loop limits

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Instead of a constant or a macro for the maximum
number of 'ws_info' elements the 100 literal was used.

Define MAX_WS_INFO in dive.h and use it everywhere.

Also clamp loops that iterate `ws_info' to MAX_WS_INFO.
Prevents potential out-of-bounds reading, similarly to
the previous commit about 'tank_info'.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
Lubomir I. Ivanov 2018-06-19 03:59:33 +03:00 • committed by Dirk Hohndel
parent 769aca9e95
commit 06a870c232
4 changed files with 12 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

3
core/dive.h
View file

@ -275,6 +275,7 @@ struct divecomputer {
#define MAX_CYLINDERS (20)
#define MAX_WEIGHTSYSTEMS (6)
#define MAX_TANK_INFO (100)
#define MAX_WS_INFO (100)
#define W_IDX_PRIMARY 0
#define W_IDX_SECONDARY 1
@ -944,7 +945,7 @@ struct ws_info_t {
const char *name;
int grams;
};
extern struct ws_info_t ws_info[100];
extern struct ws_info_t ws_info[MAX_WS_INFO];
extern bool cylinder_nodata(const cylinder_t *cyl);
extern bool cylinder_none(void *_data);

6
core/equipment.c
View file

@ -43,13 +43,13 @@ void add_weightsystem_description(weightsystem_t *weightsystem)
desc = weightsystem->description;
if (!desc)
return;
for (i = 0; i < 100 && ws_info[i].name != NULL; i++) {
for (i = 0; i < MAX_WS_INFO && ws_info[i].name != NULL; i++) {
if (strcmp(ws_info[i].name, desc) == 0) {
ws_info[i].grams = weightsystem->weight.grams;
return;
}
}
if (i < 100) {
if (i < MAX_WS_INFO) {
// FIXME: leaked on exit
ws_info[i].name = strdup(desc);
ws_info[i].grams = weightsystem->weight.grams;
@ -181,7 +181,7 @@ struct tank_info_t tank_info[100] = {
* We hardcode the most common weight system types
* This is a bit odd as the weight system types don't usually encode weight
*/
struct ws_info_t ws_info[100] = {
struct ws_info_t ws_info[MAX_WS_INFO] = {
{ QT_TRANSLATE_NOOP("gettextFromC", "integrated"), 0 },
{ QT_TRANSLATE_NOOP("gettextFromC", "belt"), 0 },
{ QT_TRANSLATE_NOOP("gettextFromC", "ankle"), 0 },