From: Andrey Konovalov andreyknvl@google.com
commit 18917d51472fe3b126a3a8f756c6b18085eb8130 upstream.
nfc_genl_deactivate_target() relies on the NFC_ATTR_TARGET_INDEX attribute being present, but doesn't check whether it is actually provided by the user. Same goes for nfc_genl_fw_download() and NFC_ATTR_FIRMWARE_NAME.
This patch adds appropriate checks.
Found with syzkaller.
Signed-off-by: Andrey Konovalov andreyknvl@google.com Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/nfc/netlink.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -981,7 +981,8 @@ static int nfc_genl_dep_link_down(struct int rc; u32 idx;
- if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) + if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || + !info->attrs[NFC_ATTR_TARGET_INDEX]) return -EINVAL;
idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); @@ -1029,7 +1030,8 @@ static int nfc_genl_llc_get_params(struc struct sk_buff *msg = NULL; u32 idx;
- 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]);