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MDEV-36341 UBSAN: FederatedX fill_server runtime error: applying non-zero offset to null pointer

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UBSAN is nuanced around null pointer additions, but there is no offset
on schema, its the start of the server->key.
This commit is contained in:
Daniel Black 2025-04-01 16:22:05 +11:00 • committed by Sergei Golubchik
commit 3995de0318
1 changed files with 11 additions and 12 deletions
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23
storage/federatedx/ha_federatedx.cc
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@ -1489,20 +1489,20 @@ static void fill_server(MEM_ROOT *mem_root, FEDERATEDX_SERVER *server,
sizeof(int) + 8);
key.append(scheme);
key.q_append('\0');
server->hostname= (const char *) (intptr) key.length();
size_t hostname_pos= key.length();
key.append(hostname);
key.q_append('\0');
server->database= (const char *) (intptr) key.length();
size_t database_pos= key.length();
key.append(database);
key.q_append('\0');
key.q_append((uint32) share->port);
server->socket= (const char *) (intptr) key.length();
size_t socket_pos= key.length();
key.append(socket);
key.q_append('\0');
server->username= (const char *) (intptr) key.length();
size_t username_pos= key.length();
key.append(username);
key.q_append('\0');
server->password= (const char *) (intptr) key.length();
size_t password_pos= key.length();
key.append(password);
key.c_ptr_safe(); // Ensure we have end \0
@ -1510,13 +1510,12 @@ static void fill_server(MEM_ROOT *mem_root, FEDERATEDX_SERVER *server,
/* Copy and add end \0 */
server->key= (uchar *) strmake_root(mem_root, key.ptr(), key.length());
/* pointer magic */
server->scheme+= (intptr) server->key;
server->hostname+= (intptr) server->key;
server->database+= (intptr) server->key;
server->username+= (intptr) server->key;
server->password+= (intptr) server->key;
server->socket+= (intptr) server->key;
server->scheme= (const char *)server->key;
server->hostname= (const char *)server->key + hostname_pos;
server->database= (const char *)server->key + database_pos;
server->username= (const char *)server->key + username_pos;
server->password= (const char *)server->key + password_pos;
server->socket= (const char*)server->key + socket_pos;
server->port= share->port;
if (!share->socket)