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NFC: fix attrs checks in netlink interface

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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 <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Andrey Konovalov authored and David S. Miller committed 2019-07-29 08:56:26 -07:00
1 parent d24b6c624b
commit 18917d5147
1 file changed
+4 -2
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net/nfc/netlink.c
+4 -2
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@@ -970,7 +970,8 @@ static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
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]);
@@ -1018,7 +1019,8 @@ static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
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]);