| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 014/112] nfc: Ensure presence of NFC_ATTR_FIRMWARE_NAME attribute in nfc_genl_fw_download() | Date | Tue, 27 Oct 2020 14:48:44 +0100 |
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From: Defang Bo <bodefang@126.com>
[ 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@126.com> Link: https://lore.kernel.org/r/1603107538-4744-1-git-send-email-bodefang@126.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/nfc/netlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -1190,7 +1190,7 @@ 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]);
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