[SRU Focal, Jammy, Lunar 1/5] igmp: limit igmpv3_newpack() packet size to IP_MAX_MTU

[Thadeu Lima de Souza Cascardo]

From: Eric Dumazet <edumazet at google.com>

This is a follow up of commit 915d975b2ffa ("net: deal with integer
overflows in kmalloc_reserve()") based on David Laight feedback.

Back in 2010, I failed to realize malicious users could set dev->mtu
to arbitrary values. This mtu has been since limited to 0x7fffffff but
regardless of how big dev->mtu is, it makes no sense for igmpv3_newpack()
to allocate more than IP_MAX_MTU and risk various skb fields overflows.

Fixes: 57e1ab6eaddc ("igmp: refine skb allocations")
Link: https://lore.kernel.org/netdev/d273628df80f45428e739274ab9ecb72@AcuMS.aculab.com/
Signed-off-by: Eric Dumazet <edumazet at google.com>
Reported-by: David Laight <David.Laight at ACULAB.COM>
Cc: Kyle Zeng <zengyhkyle at gmail.com>
Reviewed-by: Simon Horman <horms at kernel.org>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit c3b704d4a4a265660e665df51b129e8425216ed1)
CVE-2023-42752
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo at canonical.com>
---
 net/ipv4/igmp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index c920aa9a62a9..474711222999 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -353,8 +353,9 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
 	struct flowi4 fl4;
 	int hlen = LL_RESERVED_SPACE(dev);
 	int tlen = dev->needed_tailroom;
-	unsigned int size = mtu;
+	unsigned int size;
 
+	size = min(mtu, IP_MAX_MTU);
 	while (1) {
 		skb = alloc_skb(size + hlen + tlen,
 				GFP_ATOMIC | __GFP_NOWARN);
-- 
2.34.1