ASN.1: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

lib/asn1_decoder.c:386:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
lib/asn1_decoder.c:449:6: warning: this statement may fall through [-Wimplicit-fallthrough=]

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enabling
-Wimplicit-fallthrough.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/asn1_decoder.c b/lib/asn1_decoder.c
index dc14beae2c9a..8f3d207d2b00 100644
--- a/lib/asn1_decoder.c
+++ b/lib/asn1_decoder.c
@@ -385,6 +385,8 @@ next_op:
         case ASN1_OP_END_SET_ACT:
                 if (unlikely(!(flags & FLAG_MATCHED)))
                         goto tag_mismatch;
+                /* fall through */
+
         case ASN1_OP_END_SEQ:
         case ASN1_OP_END_SET_OF:
         case ASN1_OP_END_SEQ_OF:
@@ -450,6 +452,8 @@ next_op:
                         pc += asn1_op_lengths[op];
                         goto next_op;
                 }
+                /* fall through */
+
         case ASN1_OP_ACT:
                 ret = actions[machine[pc + 1]](context, hdr, tag, data + tdp, len);
                 if (ret < 0)