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net: ipv6: fix skb_over_panic in __ip6_append_data
commit 5e34af4142
upstream.
Syzbot found a kernel bug in the ipv6 stack:
LINK: https://syzkaller.appspot.com/bug?id=205d6f11d72329ab8d62a610c44c5e7e25415580
The reproducer triggers it by sending a crafted message via sendmmsg()
call, which triggers skb_over_panic, and crashes the kernel:
skbuff: skb_over_panic: text:ffffffff84647fb4 len:65575 put:65575
head:ffff888109ff0000 data:ffff888109ff0088 tail:0x100af end:0xfec0
dev:<NULL>
Update the check that prevents an invalid packet with MTU equal
to the fregment header size to eat up all the space for payload.
The reproducer can be found here:
LINK: https://syzkaller.appspot.com/text?tag=ReproC&x=1648c83fb00000
Reported-by: syzbot+e223cf47ec8ae183f2a0@syzkaller.appspotmail.com
Signed-off-by: Tadeusz Struk <tadeusz.struk@linaro.org>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20220310232538.1044947-1-tadeusz.struk@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
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1 changed files with 2 additions and 2 deletions
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@ -1321,8 +1321,8 @@ static int __ip6_append_data(struct sock *sk,
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sizeof(struct frag_hdr) : 0) +
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sizeof(struct frag_hdr) : 0) +
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rt->rt6i_nfheader_len;
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rt->rt6i_nfheader_len;
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if (mtu < fragheaderlen ||
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if (mtu <= fragheaderlen ||
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((mtu - fragheaderlen) & ~7) + fragheaderlen < sizeof(struct frag_hdr))
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((mtu - fragheaderlen) & ~7) + fragheaderlen <= sizeof(struct frag_hdr))
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goto emsgsize;
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goto emsgsize;
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maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
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maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
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