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Userland: Fix nullptr dereference if we fail to open the PCIDB

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In the code below, db could be null, and would cause UB.
Instead of crashing, let's simply skip symbolicating names.

Fixes #1247
This commit is contained in:
howar6hill 2020-02-20 11:09:20 +08:00 committed by Andreas Kling
parent 83668299a6
commit e352ee23e5
Notes: sideshowbarker 2024-07-19 17:39:41 +09:00 
Author: https://github.com/f-eiwu
Commit: https://github.com/SerenityOS/serenity/commit/e352ee23e59
Pull-request: https://github.com/SerenityOS/serenity/pull/1251
Reviewed-by: https://github.com/bugaevc
1 changed files with 15 additions and 13 deletions
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28
Userland/lspci.cpp
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@ -24,9 +24,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/String.h>
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/String.h>
#include <LibCore/File.h>
#include <LibPCIDB/Database.h>
#include <stdio.h>
@ -81,20 +81,22 @@ int main(int argc, char** argv)
auto revision_id = dev.get("revision_id").to_u32();
auto class_id = dev.get("class").to_u32();
String vendor_name = String::format("%02x", vendor_id);
auto vendor = db->get_vendor(vendor_id);
if (vendor != "")
vendor_name = vendor;
String vendor_name;
String device_name;
String class_name;
String device_name = String::format("%02x", device_id);
auto device = db->get_device(vendor_id, device_id);
if (device != "")
device_name = device;
if (db) {
vendor_name = db->get_vendor(vendor_id);
device_name = db->get_device(vendor_id, device_id);
class_name = db->get_class(class_id);
}
String class_name = String::format("%04x", class_id);
auto class_ptr = db->get_class(class_id);
if (class_ptr != "")
class_name = class_ptr;
if (vendor_name.is_empty())
vendor_name = String::format("%02x", vendor_id);
if (device_name.is_empty())
device_name = String::format("%02x", device_id);
if (class_name.is_empty())
class_name = String::format("%04x", class_id);
printf("%04x:%02x:%02x.%d %s: %s %s (rev %02x)\n",
seg, bus, slot, function,