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-rw-r--r--include/linux/asn1_ber_bytecode.h3
-rw-r--r--lib/asn1_decoder.c14
-rw-r--r--scripts/asn1_compiler.c3
3 files changed, 17 insertions, 3 deletions
diff --git a/include/linux/asn1_ber_bytecode.h b/include/linux/asn1_ber_bytecode.h
index 945d44a..27f3578 100644
--- a/include/linux/asn1_ber_bytecode.h
+++ b/include/linux/asn1_ber_bytecode.h
@@ -61,7 +61,8 @@ enum asn1_opcode {
ASN1_OP_COND_FAIL = 0x1b,
ASN1_OP_COMPLETE = 0x1c,
ASN1_OP_ACT = 0x1d,
- ASN1_OP_RETURN = 0x1e,
+ ASN1_OP_MAYBE_ACT = 0x1e,
+ ASN1_OP_RETURN = 0x1f,
/* The following eight have bit 0 -> SET, 1 -> OF, 2 -> ACT */
ASN1_OP_END_SEQ = 0x20,
diff --git a/lib/asn1_decoder.c b/lib/asn1_decoder.c
index 1a000bb..55980d7 100644
--- a/lib/asn1_decoder.c
+++ b/lib/asn1_decoder.c
@@ -33,6 +33,7 @@ static const unsigned char asn1_op_lengths[ASN1_OP__NR] = {
[ASN1_OP_COND_FAIL] = 1,
[ASN1_OP_COMPLETE] = 1,
[ASN1_OP_ACT] = 1 + 1,
+ [ASN1_OP_MAYBE_ACT] = 1 + 1,
[ASN1_OP_RETURN] = 1,
[ASN1_OP_END_SEQ] = 1,
[ASN1_OP_END_SEQ_OF] = 1 + 1,
@@ -177,6 +178,7 @@ int asn1_ber_decoder(const struct asn1_decoder *decoder,
unsigned char flags = 0;
#define FLAG_INDEFINITE_LENGTH 0x01
#define FLAG_MATCHED 0x02
+#define FLAG_LAST_MATCHED 0x04 /* Last tag matched */
#define FLAG_CONS 0x20 /* Corresponds to CONS bit in the opcode tag
* - ie. whether or not we are going to parse
* a compound type.
@@ -211,6 +213,7 @@ next_op:
if ((op & ASN1_OP_MATCH__COND &&
flags & FLAG_MATCHED) ||
dp == datalen) {
+ flags &= ~FLAG_LAST_MATCHED;
pc += asn1_op_lengths[op];
goto next_op;
}
@@ -422,8 +425,15 @@ next_op:
pc += asn1_op_lengths[op];
goto next_op;
+ case ASN1_OP_MAYBE_ACT:
+ if (!(flags & FLAG_LAST_MATCHED)) {
+ pc += asn1_op_lengths[op];
+ goto next_op;
+ }
case ASN1_OP_ACT:
ret = actions[machine[pc + 1]](context, hdr, tag, data + tdp, len);
+ if (ret < 0)
+ return ret;
pc += asn1_op_lengths[op];
goto next_op;
@@ -431,6 +441,7 @@ next_op:
if (unlikely(jsp <= 0))
goto jump_stack_underflow;
pc = jump_stack[--jsp];
+ flags |= FLAG_MATCHED | FLAG_LAST_MATCHED;
goto next_op;
default:
@@ -438,7 +449,8 @@ next_op:
}
/* Shouldn't reach here */
- pr_err("ASN.1 decoder error: Found reserved opcode (%u)\n", op);
+ pr_err("ASN.1 decoder error: Found reserved opcode (%u) pc=%zu\n",
+ op, pc);
return -EBADMSG;
data_overrun_error:
diff --git a/scripts/asn1_compiler.c b/scripts/asn1_compiler.c
index e87359c..0515bce 100644
--- a/scripts/asn1_compiler.c
+++ b/scripts/asn1_compiler.c
@@ -1468,7 +1468,8 @@ dont_render_tag:
case TYPE_REF:
render_element(out, e->type->type->element, tag);
if (e->action)
- render_opcode(out, "ASN1_OP_ACT,\n");
+ render_opcode(out, "ASN1_OP_%sACT,\n",
+ skippable ? "MAYBE_" : "");
break;
case SEQUENCE:
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