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Merge pull request #376 from jwrdegoede/oss-fuzz-36187-null-ptr-deref-fix

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Fix null-ptr deref when table->map_sz is 0
This commit is contained in:
Evan Miller
2022-01-25 10:24:14 -05:00
committed by GitHub
parent bcad261464 4febc7b5c6
commit 2da65ffdb3
1 changed files with 6 additions and 0 deletions
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6
src/libmdb/table.c
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@@ -92,6 +92,12 @@ MdbTableDef *mdb_read_table(MdbCatalogEntry *entry)
mdb_free_tabledef(table);
return NULL;
}
/* First byte of usage_map is the map-type and must always be present */
if (table->map_sz < 1) {
fprintf(stderr, "mdb_read_table: invalid map-size: %zu\n", table->map_sz);
mdb_free_tabledef(table);
return NULL;
}
table->usage_map = g_memdup2((char*)buf + row_start, table->map_sz);
if (mdb_get_option(MDB_DEBUG_USAGE))
mdb_buffer_dump(buf, row_start, table->map_sz);