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Fix potential int truncation and double-check lengths before copy

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jfreegman 2017-08-28 19:37:19 -04:00
parent 80c0500299
commit 52dd60dc86
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2 changed files with 14 additions and 5 deletions
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15
src/friendlist.c
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@ -153,10 +153,14 @@ static int save_blocklist(char *path)
} }
if (Blocked.list[i].active) { if (Blocked.list[i].active) {
if (Blocked.list[i].namelength > TOXIC_MAX_NAME_LENGTH) {
continue;
}
BlockedFriend tmp; BlockedFriend tmp;
memset(&tmp, 0, sizeof(BlockedFriend)); memset(&tmp, 0, sizeof(BlockedFriend));
tmp.namelength = htons(Blocked.list[i].namelength); tmp.namelength = htons(Blocked.list[i].namelength);
memcpy(tmp.name, Blocked.list[i].name, Blocked.list[i].namelength + 1); memcpy(tmp.name, Blocked.list[i].name, Blocked.list[i].namelength + 1); // Include null byte
memcpy(tmp.pub_key, Blocked.list[i].pub_key, TOX_PUBLIC_KEY_SIZE); memcpy(tmp.pub_key, Blocked.list[i].pub_key, TOX_PUBLIC_KEY_SIZE);
uint8_t lastonline[sizeof(uint64_t)]; uint8_t lastonline[sizeof(uint64_t)];
@ -250,10 +254,15 @@ int load_blocklist(char *path)
memset(&Blocked.list[i], 0, sizeof(BlockedFriend)); memset(&Blocked.list[i], 0, sizeof(BlockedFriend));
memcpy(&tmp, data + i * sizeof(BlockedFriend), sizeof(BlockedFriend)); memcpy(&tmp, data + i * sizeof(BlockedFriend), sizeof(BlockedFriend));
Blocked.list[i].namelength = ntohs(tmp.namelength);
if (Blocked.list[i].namelength > TOXIC_MAX_NAME_LENGTH) {
continue;
}
Blocked.list[i].active = true; Blocked.list[i].active = true;
Blocked.list[i].num = i; Blocked.list[i].num = i;
Blocked.list[i].namelength = MIN(TOXIC_MAX_NAME_LENGTH, ntohs(tmp.namelength)); memcpy(Blocked.list[i].name, tmp.name, Blocked.list[i].namelength + 1); // copy null byte
memcpy(Blocked.list[i].name, tmp.name, Blocked.list[i].namelength + 1);
memcpy(Blocked.list[i].pub_key, tmp.pub_key, TOX_PUBLIC_KEY_SIZE); memcpy(Blocked.list[i].pub_key, tmp.pub_key, TOX_PUBLIC_KEY_SIZE);
uint8_t lastonline[sizeof(uint64_t)]; uint8_t lastonline[sizeof(uint64_t)];

4
src/friendlist.h
View File

@ -44,7 +44,7 @@ struct GroupChatInvite {
typedef struct { typedef struct {
char name[TOXIC_MAX_NAME_LENGTH + 1]; char name[TOXIC_MAX_NAME_LENGTH + 1];
int namelength; uint16_t namelength;
char statusmsg[TOX_MAX_STATUS_MESSAGE_LENGTH + 1]; char statusmsg[TOX_MAX_STATUS_MESSAGE_LENGTH + 1];
size_t statusmsg_len; size_t statusmsg_len;
char pub_key[TOX_PUBLIC_KEY_SIZE]; char pub_key[TOX_PUBLIC_KEY_SIZE];
@ -65,7 +65,7 @@ typedef struct {
typedef struct { typedef struct {
char name[TOXIC_MAX_NAME_LENGTH + 1]; char name[TOXIC_MAX_NAME_LENGTH + 1];
int namelength; uint16_t namelength;
char pub_key[TOX_PUBLIC_KEY_SIZE]; char pub_key[TOX_PUBLIC_KEY_SIZE];
uint32_t num; uint32_t num;
bool active; bool active;