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net: don't memcpy to NULL

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In ndisc_receive() 7 bytes are copied from a buffer of size 6 to NULL.

net_nd_packet_mac is a pointer. If it is NULL, we should set it to the
address of the buffer with the MAC address.

Addresses-Coverity-ID: 430974 ("Out-of-bounds access")
Fixes: c6610e1d90 ("net: ipv6: Add Neighbor Discovery Protocol (NDP)")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
This commit is contained in:
Heinrich Schuchardt 2022-12-07 11:53:29 +01:00 committed by Tom Rini
parent 0d6d5a4aa6
commit 56e3b14703
1 changed files with 1 additions and 1 deletions
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2
net/ndisc.c
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@ -265,7 +265,7 @@ int ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
/* save address for later use */
if (!net_nd_packet_mac)
memcpy(net_nd_packet_mac, neigh_eth_addr, 7);
net_nd_packet_mac = neigh_eth_addr;
/* modify header, and transmit it */
memcpy(((struct ethernet_hdr *)net_nd_tx_packet)->et_dest,