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Check return value of sscanf to handle potential undefined behaviour in write_keymaps #147

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Check return value of sscanf to handle potential undefined behaviour in write_keymaps #147

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13 changes: 10 additions & 3 deletions util/grub-mklayout.c
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Original file line number Diff line number Diff line change
Expand Up @@ -380,9 +380,16 @@ write_keymaps (FILE *in, FILE *out, const char *out_filename)
char shift[64];
char normalalt[64];
char shiftalt[64];

sscanf (line, "keycode %u = %60s %60s %60s %60s", &keycode_linux,
normal, shift, normalalt, shiftalt);

if (sscanf (line, "keycode %u = %60s %60s %60s %60s", &keycode_linux,
normal, shift, normalalt, shiftalt) != 5) {
/* Bail out since keycodes could not be read, this can happen
* when the in FILE is coming from stdin and user fails to specify the keycode in
* proper format
*/
fprintf (stderr, "%s", _("ERROR: no valid keyboard layout found. Check the input.\n"));
exit (1);
}

if (keycode_linux >= ARRAY_SIZE (linux_to_usb_map))
{
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