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prevent segfault in case we hit an empty sequence

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This commit is contained in:
Steffen Jaeckel 2015-09-10 19:17:42 +02:00
parent d4945ac521
commit 16f397d55c
1 changed files with 14 additions and 8 deletions
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22
src/pk/asn1/der/sequence/der_decode_sequence_flexi.c
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@ -361,8 +361,11 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
/* len update */
totlen += data_offset;
/* link them up y0 */
l->child->parent = l;
/* the flexi decoder can also do nothing, so make sure a child has been allocated */
if (l->child) {
/* link them up y0 */
l->child->parent = l;
}
break;
@ -398,12 +401,15 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
outside:
/* rewind l please */
while (l->prev != NULL || l->parent != NULL) {
if (l->parent != NULL) {
l = l->parent;
} else {
l = l->prev;
/* in case we processed anything */
if (totlen) {
/* rewind l please */
while (l->prev != NULL || l->parent != NULL) {
if (l->parent != NULL) {
l = l->parent;
} else {
l = l->prev;
}
}
}