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| author | Eric Dumazet <edumazet@google.com> | 2017-02-03 14:59:38 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-02-26 20:01:32 +0000 |
| commit | cd3b9e464ca54547965df76463bdfb26e6712287 (patch) | |
| tree | 9e39f3105089556ec1751a523c05eb5388dec8ca /firmware | |
| parent | fd75b79ea9c7cf89d5b95f9896c6b4dcdac8c4cb (diff) | |
| download | linux-stable-cd3b9e464ca54547965df76463bdfb26e6712287.tar.gz linux-stable-cd3b9e464ca54547965df76463bdfb26e6712287.tar.bz2 linux-stable-cd3b9e464ca54547965df76463bdfb26e6712287.zip | |
tcp: avoid infinite loop in tcp_splice_read()
commit ccf7abb93af09ad0868ae9033d1ca8108bdaec82 upstream.
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: 9c55e01c0cc8 ("[TCP]: Splice receive support.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'firmware')
0 files changed, 0 insertions, 0 deletions