hnbap,rua,ranap decode: fix segfault on decode error
Looking at hnbap_decode_hnbregisterrequesties(), I noticed a segfault if decoding the HNB Register Request PDU fails, which is due to an unchecked return value in code generated by asn1tostruct.py. Add return value and NULL pointer checks and hence fix null dereference on erratic PDUs across HNBAP, RUA and RANAP protocols. Similar checks exist in other places, this one was simply missing. Since the result of asn1tostruct.py is not committed, here is an example diff of the resulting change, of which there are 128 instances in total: @@ -304,7 +329,12 @@ memset(hnbRegisterRequestIEs, 0, sizeof(HNBRegisterRequestIEs_t)); HNBAP_DEBUG("Decoding message HNBRegisterRequestIEs (%s:%d)\n", __FILE__, __LINE__); - ANY_to_type_aper(any_p, &asn_DEF_HNBRegisterRequest, (void**)&hNBRegisterRequest_p); + tempDecoded = ANY_to_type_aper(any_p, &asn_DEF_HNBRegisterRequest, (void**)&hNBRegisterRequest_p); + + if (tempDecoded < 0 || hNBRegisterRequest_p == NULL) { + HNBAP_DEBUG("Decoding of message HNBRegisterRequestIEs failed\n"); + return -1; + } for (i = 0; i < hNBRegisterRequest_p->hnbRegisterRequest_ies.list.count; i++) { IE_t *ie_p; Change-Id: I6cb9cc9a88d22f03befa43f0968a874476fa079d
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@ -311,7 +311,12 @@ for key in iesDefs:
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f.write(" memset(%s, 0, sizeof(%s_t));\n" % (lowerFirstCamelWord(re.sub('-', '_', key)), prefix + re.sub('-', '_', key)))
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f.write(" %s_DEBUG(\"Decoding message %s (%%s:%%d)\\n\", __FILE__, __LINE__);\n\n" % (fileprefix.upper(), prefix + re.sub('-', '_', keyName)))
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f.write(" ANY_to_type_aper(any_p, &asn_DEF_%s, (void**)&%s_p);\n\n" % (asn1cStruct, asn1cStructfirstlower))
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f.write(" tempDecoded = ANY_to_type_aper(any_p, &asn_DEF_%s, (void**)&%s_p);\n\n" % (asn1cStruct, asn1cStructfirstlower))
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f.write(" if (tempDecoded < 0 || %s_p == NULL) {\n" % (asn1cStructfirstlower))
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f.write(" %s_DEBUG(\"Decoding of message %s failed\\n\");\n" % (fileprefix.upper(), prefix + re.sub('-', '_', keyName)))
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f.write(" return -1;\n")
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f.write(" }\n\n")
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f.write(" for (i = 0; i < %s_p->%slist.count; i++) {\n" % (asn1cStructfirstlower, iesaccess))
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f.write(" %sIE_t *ie_p;\n" % (prefix))
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f.write(" ie_p = %s_p->%slist.array[i];\n" % (asn1cStructfirstlower, iesaccess))
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