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Guard against trying to map an empty string pool into memory

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This commit is contained in:
Eric Fischer 2015-12-22 14:27:38 -08:00
parent a8b39aa2ff
commit ca4d1beb7c
1 changed files with 7 additions and 4 deletions
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5
geojson.c
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@ -1633,11 +1633,14 @@ int read_json(int argc, char **argv, char *fname, const char *layername, int max
exit(EXIT_FAILURE);
}
char *stringpool = (char *) mmap(NULL, poolpos, PROT_READ, MAP_PRIVATE, poolfd, 0);
char *stringpool = NULL;
if (poolpos > 0) { // Will be 0 if -X was specified
stringpool = (char *) mmap(NULL, poolpos, PROT_READ, MAP_PRIVATE, poolfd, 0);
if (stringpool == MAP_FAILED) {
perror("mmap string pool");
exit(EXIT_FAILURE);
}
}
unsigned midx = 0, midy = 0;
int written = traverse_zooms(fd, size, meta, stringpool, file_keys, &midx, &midy, layernames, maxzoom, minzoom, basezoom, outdb, droprate, buffer, fname, tmpdir, gamma, nlayers, prevent, additional, full_detail, low_detail, min_detail, meta_off, pool_off);