bpf: reduce compiler warnings by adding fallthrough comments
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>
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1a754e5..d2bded2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -701,6 +701,7 @@
/* 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 @@
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 @@
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 @@
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 @@
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.