Re: [PATCH v3 net] dccp/tcp: fix ireq->opt races

[David Miller <davem@davemloft.net>]

From: David Miller <davem@davemloft.net>
Date: Fri, 20 Oct 2017 07:04:58 +0100 (WEST)

> Much better, applied and queued up for -stable.

I take that back.

Please build test your changes more thoroughly.

In file included from ./arch/x86/include/asm/atomic.h:7:0,
                 from ./include/linux/atomic.h:4,
                 from ./include/linux/rcupdate.h:38,
                 from net/ipv4/cipso_ipv4.c:40:
net/ipv4/cipso_ipv4.c: In function ‘cipso_v4_req_setattr’:
net/ipv4/cipso_ipv4.c:1954:22: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = xchg(&req_inet->opt, opt);
                      ^
./arch/x86/include/asm/cmpxchg.h:43:24: note: in definition of macro ‘__xchg_op’
          __typeof__ (*(ptr)) __ret = (arg);   \
                        ^~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
./arch/x86/include/asm/cmpxchg.h:43:38: warning: initialization makes integer from pointer without a cast [-Wint-conversion]
          __typeof__ (*(ptr)) __ret = (arg);   \
                                      ^
./arch/x86/include/asm/cmpxchg.h:77:22: note: in expansion of macro ‘__xchg_op’
 #define xchg(ptr, v) __xchg_op((ptr), (v), xchg, "")
                      ^~~~~~~~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
net/ipv4/cipso_ipv4.c:1954:22: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = xchg(&req_inet->opt, opt);
                      ^
./arch/x86/include/asm/cmpxchg.h:44:20: note: in definition of macro ‘__xchg_op’
   switch (sizeof(*(ptr))) {    \
                    ^~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
net/ipv4/cipso_ipv4.c:1954:22: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = xchg(&req_inet->opt, opt);
                      ^
./arch/x86/include/asm/cmpxchg.h:47:35: note: in definition of macro ‘__xchg_op’
           : "+q" (__ret), "+m" (*(ptr)) \
                                   ^~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
net/ipv4/cipso_ipv4.c:1954:22: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = xchg(&req_inet->opt, opt);
                      ^
./arch/x86/include/asm/cmpxchg.h:52:35: note: in definition of macro ‘__xchg_op’
           : "+r" (__ret), "+m" (*(ptr)) \
                                   ^~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
net/ipv4/cipso_ipv4.c:1954:22: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = xchg(&req_inet->opt, opt);
                      ^
./arch/x86/include/asm/cmpxchg.h:57:35: note: in definition of macro ‘__xchg_op’
           : "+r" (__ret), "+m" (*(ptr)) \
                                   ^~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
net/ipv4/cipso_ipv4.c:1954:22: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = xchg(&req_inet->opt, opt);
                      ^
./arch/x86/include/asm/cmpxchg.h:62:35: note: in definition of macro ‘__xchg_op’
           : "+r" (__ret), "+m" (*(ptr)) \
                                   ^~~
net/ipv4/cipso_ipv4.c:1954:8: note: in expansion of macro ‘xchg’
  opt = xchg(&req_inet->opt, opt);
        ^~~~
net/ipv4/cipso_ipv4.c:1954:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
  opt = xchg(&req_inet->opt, opt);
      ^
net/ipv4/cipso_ipv4.c: In function ‘cipso_v4_req_delattr’:
net/ipv4/cipso_ipv4.c:2073:16: error: ‘struct inet_request_sock’ has no member named ‘opt’
  opt = req_inet->opt;
                ^~
net/ipv4/cipso_ipv4.c:2077:27: error: ‘struct inet_request_sock’ has no member named ‘opt’
  cipso_v4_delopt(&req_inet->opt);
                           ^~
scripts/Makefile.build:313: recipe for target 'net/ipv4/cipso_ipv4.o' failed
make[2]: *** [net/ipv4/cipso_ipv4.o] Error 1
make[2]: *** Waiting for unfinished jobs....
scripts/Makefile.build:572: recipe for target 'net/ipv4' failed
make[1]: *** [net/ipv4] Error 2
Makefile:1019: recipe for target 'net' failed
make: *** [net] Error 2