summaryrefslogtreecommitdiff
path: root/lib/asn1_decoder.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/asn1_decoder.c')
-rw-r--r--lib/asn1_decoder.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/lib/asn1_decoder.c b/lib/asn1_decoder.c
index b1ffcab7211a..0bd8a611eb83 100644
--- a/lib/asn1_decoder.c
+++ b/lib/asn1_decoder.c
@@ -75,7 +75,7 @@ next_tag:
/* Extract a tag from the data */
tag = data[dp++];
- if (tag == 0) {
+ if (tag == ASN1_EOC) {
/* It appears to be an EOC. */
if (data[dp++] != 0)
goto invalid_eoc;
@@ -97,10 +97,8 @@ next_tag:
/* Extract the length */
len = data[dp++];
- if (len <= 0x7f) {
- dp += len;
- goto next_tag;
- }
+ if (len <= 0x7f)
+ goto check_length;
if (unlikely(len == ASN1_INDEFINITE_LENGTH)) {
/* Indefinite length */
@@ -111,14 +109,18 @@ next_tag:
}
n = len - 0x80;
- if (unlikely(n > sizeof(size_t) - 1))
+ if (unlikely(n > sizeof(len) - 1))
goto length_too_long;
if (unlikely(n > datalen - dp))
goto data_overrun_error;
- for (len = 0; n > 0; n--) {
+ len = 0;
+ for (; n > 0; n--) {
len <<= 8;
len |= data[dp++];
}
+check_length:
+ if (len > datalen - dp)
+ goto data_overrun_error;
dp += len;
goto next_tag;