Possible leaks:

MonetDB-11.37.7\common\stream\stream.

if (stream_bzread(s, buf, 1, UTF8BOMLENGTH) == UTF8BOMLENGTH &&
   strncmp(buf, UTF8BOM, UTF8BOMLENGTH) == 0) {
s->isutf8 = true;
} else if (s->stream_data.p) {
bzp = s->stream_data.p;
BZ2_bzReadClose(&err, bzp->b);
rewind(bzp->f);
bzp->b = BZ2_bzReadOpen(&err, bzp->f, 0, 0, NULL, 0);
}

If stream_bzread at line 1302 is successful, and  (s->stream_data.p) is not null at line 1305,

bzp (original pointer malloc) is not lost at line 1306?

bzp = s->stream_data.p;

2. At line 1322:

if (err != BZ_OK) {
stream_bzclose(s);
destroy(s);
return NULL;
}

miss free(bzp);?

destroy(s) do not free bzp, according, with line 1283.

3. At line 2350

miss free(c);

regards,

Ranier Vilela