This is a note to let you know that I've just added the patch titled [PATCH stable 5.9 20/30] nfc: Ensure presence of NFC_ATTR_FIRMWARE_NAME attribute in nfc_genl_fw_download() to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nfc-ensure-presence-of-nfc_attr_firmware_name-attribute-in-nfc_genl_fw_download.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sat Oct 24 10:56:06 AM CEST 2020 From: Defang Bo <bodefang@xxxxxxx> Date: Mon, 19 Oct 2020 19:38:58 +0800 Subject: [PATCH stable 5.9 20/30] nfc: Ensure presence of NFC_ATTR_FIRMWARE_NAME attribute in nfc_genl_fw_download() From: Defang Bo <bodefang@xxxxxxx> [ Upstream commit 280e3ebdafb863b3cb50d5842f056267e15bf40c ] Check that the NFC_ATTR_FIRMWARE_NAME attributes are provided by the netlink client prior to accessing them.This prevents potential unhandled NULL pointer dereference exceptions which can be triggered by malicious user-mode programs, if they omit one or both of these attributes. Similar to commit a0323b979f81 ("nfc: Ensure presence of required attributes in the activate_target handler"). Fixes: 9674da8759df ("NFC: Add firmware upload netlink command") Signed-off-by: Defang Bo <bodefang@xxxxxxx> Link: https://lore.kernel.org/r/1603107538-4744-1-git-send-email-bodefang@xxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/nfc/netlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -1217,7 +1217,7 @@ static int nfc_genl_fw_download(struct s u32 idx; char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1]; - if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) + if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME]) return -EINVAL; idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); Patches currently in stable-queue which might be from bodefang@xxxxxxx are queue-5.9/nfc-ensure-presence-of-nfc_attr_firmware_name-attribute-in-nfc_genl_fw_download.patch