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-rw-r--r--lib/asn1_decoder.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/lib/asn1_decoder.c b/lib/asn1_decoder.c
index 1a000bb050f9..2b3f46c049d4 100644
--- a/lib/asn1_decoder.c
+++ b/lib/asn1_decoder.c
@@ -24,15 +24,20 @@ static const unsigned char asn1_op_lengths[ASN1_OP__NR] = {
[ASN1_OP_MATCH_JUMP] = 1 + 1 + 1,
[ASN1_OP_MATCH_JUMP_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_MATCH_ANY] = 1,
+ [ASN1_OP_MATCH_ANY_OR_SKIP] = 1,
[ASN1_OP_MATCH_ANY_ACT] = 1 + 1,
+ [ASN1_OP_MATCH_ANY_ACT_OR_SKIP] = 1 + 1,
[ASN1_OP_COND_MATCH_OR_SKIP] = 1 + 1,
[ASN1_OP_COND_MATCH_ACT_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_COND_MATCH_JUMP_OR_SKIP] = 1 + 1 + 1,
[ASN1_OP_COND_MATCH_ANY] = 1,
+ [ASN1_OP_COND_MATCH_ANY_OR_SKIP] = 1,
[ASN1_OP_COND_MATCH_ANY_ACT] = 1 + 1,
+ [ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP] = 1 + 1,
[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 +182,7 @@ 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.
@@ -208,9 +214,9 @@ next_op:
unsigned char tmp;
/* Skip conditional matches if possible */
- if ((op & ASN1_OP_MATCH__COND &&
- flags & FLAG_MATCHED) ||
- dp == datalen) {
+ if ((op & ASN1_OP_MATCH__COND && flags & FLAG_MATCHED) ||
+ (op & ASN1_OP_MATCH__SKIP && dp == datalen)) {
+ flags &= ~FLAG_LAST_MATCHED;
pc += asn1_op_lengths[op];
goto next_op;
}
@@ -302,7 +308,9 @@ next_op:
/* Decide how to handle the operation */
switch (op) {
case ASN1_OP_MATCH_ANY_ACT:
+ case ASN1_OP_MATCH_ANY_ACT_OR_SKIP:
case ASN1_OP_COND_MATCH_ANY_ACT:
+ case ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP:
ret = actions[machine[pc + 1]](context, hdr, tag, data + dp, len);
if (ret < 0)
return ret;
@@ -319,8 +327,10 @@ next_op:
case ASN1_OP_MATCH:
case ASN1_OP_MATCH_OR_SKIP:
case ASN1_OP_MATCH_ANY:
+ case ASN1_OP_MATCH_ANY_OR_SKIP:
case ASN1_OP_COND_MATCH_OR_SKIP:
case ASN1_OP_COND_MATCH_ANY:
+ case ASN1_OP_COND_MATCH_ANY_OR_SKIP:
skip_data:
if (!(flags & FLAG_CONS)) {
if (flags & FLAG_INDEFINITE_LENGTH) {
@@ -422,8 +432,15 @@ 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 +448,7 @@ 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 +456,8 @@ 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:

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