bpf: Fix bug in mmap() implementation for BPF array map

[linux-2.6-microblaze.git] / tools / testing / selftests / bpf / prog_tests / mmap.c

diff --git a/tools/testing/selftests/bpf/prog_tests/mmap.c b/tools/testing/selftests/bpf/prog_tests/mmap.c
index 56d80ad..6b9dce4 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/mmap.c
+++ b/tools/testing/selftests/bpf/prog_tests/mmap.c
@@ -217,6 +217,14 @@ void test_mmap(void)
 
        munmap(tmp2, 4 * page_size);
 
+       /* map all 4 pages, but with pg_off=1 page, should fail */
+       tmp1 = mmap(NULL, 4 * page_size, PROT_READ, MAP_SHARED | MAP_FIXED,
+                   data_map_fd, page_size /* initial page shift */);
+       if (CHECK(tmp1 != MAP_FAILED, "adv_mmap7", "unexpected success")) {
+               munmap(tmp1, 4 * page_size);
+               goto cleanup;
+       }
+
        tmp1 = mmap(NULL, map_sz, PROT_READ, MAP_SHARED, data_map_fd, 0);
        if (CHECK(tmp1 == MAP_FAILED, "last_mmap", "failed %d\n", errno))
                goto cleanup;