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Fix null pointer dereference found by libfuzzer

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This commit is contained in:
Matt Johnston 2017-05-21 18:53:09 +08:00
parent 72f85ad90f
commit 0ab0687a3a
1 changed files with 5 additions and 4 deletions
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9
signkey.c
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@ -102,7 +102,8 @@ enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen)
return DROPBEAR_SIGNKEY_NONE;
}
/* Returns a pointer to the key part specific to "type" */
/* Returns a pointer to the key part specific to "type".
Be sure to check both (ret != NULL) and (*ret != NULL) */
void **
signkey_key_ptr(sign_key *key, enum signkey_type type) {
switch (type) {
@ -297,7 +298,7 @@ void buf_put_pub_key(buffer* buf, sign_key *key, enum signkey_type type) {
#if DROPBEAR_ECDSA
if (signkey_is_ecdsa(type)) {
ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
if (eck) {
if (eck && *eck) {
buf_put_ecdsa_pub_key(pubkeys, *eck);
}
}
@ -334,7 +335,7 @@ void buf_put_priv_key(buffer* buf, sign_key *key, enum signkey_type type) {
#if DROPBEAR_ECDSA
if (signkey_is_ecdsa(type)) {
ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
if (eck) {
if (eck && *eck) {
buf_put_ecdsa_priv_key(buf, *eck);
TRACE(("leave buf_put_priv_key: ecdsa done"))
return;
@ -498,7 +499,7 @@ void buf_put_sign(buffer* buf, sign_key *key, enum signkey_type type,
#if DROPBEAR_ECDSA
if (signkey_is_ecdsa(type)) {
ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
if (eck) {
if (eck && *eck) {
buf_put_ecdsa_sign(sigblob, *eck, data_buf);
}
}