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bpf: reduce compiler warnings by adding fallthrough comments

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Fixes the following warnings:

kernel/bpf/verifier.c: In function ‘may_access_direct_pkt_data’:
kernel/bpf/verifier.c:702:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (t == BPF_WRITE)
      ^
kernel/bpf/verifier.c:704:2: note: here
  case BPF_PROG_TYPE_SCHED_CLS:
  ^~~~
kernel/bpf/verifier.c: In function ‘reg_set_min_max_inv’:
kernel/bpf/verifier.c:2057:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
   true_reg->min_value = 0;
   ~~~~~~~~~~~~~~~~~~~~^~~
kernel/bpf/verifier.c:2058:2: note: here
  case BPF_JSGT:
  ^~~~
kernel/bpf/verifier.c:2068:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
   true_reg->min_value = 0;
   ~~~~~~~~~~~~~~~~~~~~^~~
kernel/bpf/verifier.c:2069:2: note: here
  case BPF_JSGE:
  ^~~~
kernel/bpf/verifier.c: In function ‘reg_set_min_max’:
kernel/bpf/verifier.c:2009:24: warning: this statement may fall through [-Wimplicit-fallthrough=]
   false_reg->min_value = 0;
   ~~~~~~~~~~~~~~~~~~~~~^~~
kernel/bpf/verifier.c:2010:2: note: here
  case BPF_JSGT:
  ^~~~
kernel/bpf/verifier.c:2019:24: warning: this statement may fall through [-Wimplicit-fallthrough=]
   false_reg->min_value = 0;
   ~~~~~~~~~~~~~~~~~~~~~^~~
kernel/bpf/verifier.c:2020:2: note: here
  case BPF_JSGE:
  ^~~~

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Alexander Alemayhu <alexander@alemayhu.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Alemayhu 2017-02-14 00:02:35 +01:00 committed by David S. Miller
parent 2be4cb973f
commit 7e57fbb2a3
1 changed files with 5 additions and 0 deletions
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5
kernel/bpf/verifier.c
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@ -701,6 +701,7 @@ static bool may_access_direct_pkt_data(struct bpf_verifier_env *env,
/* dst_input() and dst_output() can't write for now */
if (t == BPF_WRITE)
return false;
/* fallthrough */
case BPF_PROG_TYPE_SCHED_CLS:
case BPF_PROG_TYPE_SCHED_ACT:
case BPF_PROG_TYPE_XDP:
@ -2007,6 +2008,7 @@ static void reg_set_min_max(struct bpf_reg_state *true_reg,
case BPF_JGT:
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
/* fallthrough */
case BPF_JSGT:
/* If this is false then we know the maximum val is val,
* otherwise we know the min val is val+1.
@ -2017,6 +2019,7 @@ static void reg_set_min_max(struct bpf_reg_state *true_reg,
case BPF_JGE:
/* Unsigned comparison, the minimum value is 0. */
false_reg->min_value = 0;
/* fallthrough */
case BPF_JSGE:
/* If this is false then we know the maximum value is val - 1,
* otherwise we know the mimimum value is val.
@ -2055,6 +2058,7 @@ static void reg_set_min_max_inv(struct bpf_reg_state *true_reg,
case BPF_JGT:
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
/* fallthrough */
case BPF_JSGT:
/*
* If this is false, then the val is <= the register, if it is
@ -2066,6 +2070,7 @@ static void reg_set_min_max_inv(struct bpf_reg_state *true_reg,
case BPF_JGE:
/* Unsigned comparison, the minimum value is 0. */
true_reg->min_value = 0;
/* fallthrough */
case BPF_JSGE:
/* If this is false then constant < register, if it is true then
* the register < constant.