From: Alexey Dobriyan [IPV4/IPV6] multicast: Check add_grhead() return value add_grhead() allocates memory with GFP_ATOMIC and in at least two places skb from it passed to skb_put() without checking. Signed-off-by: Alexey Dobriyan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/igmp.c | 2 ++ net/ipv6/mcast.c | 2 ++ 2 files changed, 4 insertions(+) --- linux-2.6.20.1.orig/net/ipv4/igmp.c +++ linux-2.6.20.1/net/ipv4/igmp.c @@ -455,6 +455,8 @@ static struct sk_buff *add_grec(struct s skb = add_grhead(skb, pmc, type, &pgr); first = 0; } + if (!skb) + return NULL; psrc = (__be32 *)skb_put(skb, sizeof(__be32)); *psrc = psf->sf_inaddr; scount++; stotal++; --- linux-2.6.20.1.orig/net/ipv6/mcast.c +++ linux-2.6.20.1/net/ipv6/mcast.c @@ -1582,6 +1582,8 @@ static struct sk_buff *add_grec(struct s skb = add_grhead(skb, pmc, type, &pgr); first = 0; } + if (!skb) + return NULL; psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); *psrc = psf->sf_addr; scount++; stotal++; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/