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Commit 1616f1d5 authored by Eric Dumazet's avatar Eric Dumazet Committed by Zvikomborero Vincent Zvikaramba
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BACKPORT: tcp: avoid infinite loop in tcp_splice_read()



Splicing from TCP socket is vulnerable when a packet with URG flag is
received and stored into receive queue.

__tcp_splice_read() returns 0, and sk_wait_data() immediately
returns since there is the problematic skb in queue.

This is a nice way to burn cpu (aka infinite loop) and trigger
soft lockups.

Again, this gem was found by syzkaller tool.

Fixes: 9c55e01c ("[TCP]: Splice receive support.")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Change-Id: Ic8000917deb6ce7ca4ce2af0c8ce951355051ec9
parent 27b5e6c3
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