diff options
| -rw-r--r-- | drivers/platform/x86/dell-wmi.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c index d6ae69e..32808a4 100644 --- a/drivers/platform/x86/dell-wmi.c +++ b/drivers/platform/x86/dell-wmi.c @@ -351,13 +351,24 @@ static void __init handle_dmi_entry(const struct dmi_header *dm, if (results->err || results->keymap) return; /* We already found the hotkey table. */ - if (dm->type != 0xb2 || dm->length <= 6) + if (dm->type != 0xb2) return; table = container_of(dm, struct dell_bios_hotkey_table, header); - hotkey_num = (table->header.length - 4) / + hotkey_num = (table->header.length - + sizeof(struct dell_bios_hotkey_table)) / sizeof(struct dell_bios_keymap_entry); + if (hotkey_num < 1) { + /* + * Historically, dell-wmi would ignore a DMI entry of + * fewer than 7 bytes. Sizes between 4 and 8 bytes are + * nonsensical (both the header and all entries are 4 + * bytes), so we approximate the old behavior by + * ignoring tables with fewer than one entry. + */ + return; + } keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL); if (!keymap) { |