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equipment: sanitize 'tank_info' loop limits

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In a number of places the global 'tank_info' array
is being iterated based on a 'tank_info[idx].name != NULL'
condition.

This is dangerous because if the user has added a lot of tanks,
such loops can reach 'tank_info[MAX_TANK_INFO]'. This is an
out of bounds read and if the 'name' pointer there happens to be
non-NULL, passing that address to a peace of code that tries
to read it (like strlen()) would either SIGSEGV or have undefined
behavior.

Clamp all loops that iterate 'tank_info' to MAX_TANK_INFO.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
Lubomir I. Ivanov 2018-06-19 03:19:56 +03:00 • committed by Dirk Hohndel
parent a5380bb741
commit 769aca9e95
3 changed files with 4 additions and 5 deletions
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2
desktop-widgets/preferences/preferences_defaults.cpp
View file

@ -52,7 +52,7 @@ void PreferencesDefaults::refreshSettings()
ui->localDefaultFile->setChecked(prefs.default_file_behavior == LOCAL_DEFAULT_FILE);
ui->default_cylinder->clear();
for (int i = 0; tank_info[i].name != NULL; i++) {
for (int i = 0; tank_info[i].name != NULL && i < MAX_TANK_INFO; i++) {
ui->default_cylinder->addItem(tank_info[i].name);
if (prefs.default_cylinder && strcmp(tank_info[i].name, prefs.default_cylinder) == 0)
ui->default_cylinder->setCurrentIndex(i);