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authorEric Dumazet <edumazet@google.com>2016-11-02 17:53:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-11-21 12:06:39 +0300
commit69a5c7ca2e62072bcf2de664fdf038b64133d5d5 (patch)
treefb5aa0152f5db1051c15d48a6c29792d9b178c37 /net/dccp
parent8777977b22c47c47873bdf9e88aa20cc701257bd (diff)
downloadlinux-69a5c7ca2e62072bcf2de664fdf038b64133d5d5.tar.xz
tcp: fix potential memory corruption
[ Upstream commit ac9e70b17ecd7c6e933ff2eaf7ab37429e71bf4d ] Imagine initial value of max_skb_frags is 17, and last skb in write queue has 15 frags. Then max_skb_frags is lowered to 14 or smaller value. tcp_sendmsg() will then be allowed to add additional page frags and eventually go past MAX_SKB_FRAGS, overflowing struct skb_shared_info. Fixes: 5f74f82ea34c ("net:Add sysctl_max_skb_frags") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Hans Westgaard Ry <hans.westgaard.ry@oracle.com> Cc: HÃ¥kon Bugge <haakon.bugge@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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