diff options
| -rw-r--r-- | util/cbmem/cbmem.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/util/cbmem/cbmem.c b/util/cbmem/cbmem.c index c1b1caa572..48a1bc963d 100644 --- a/util/cbmem/cbmem.c +++ b/util/cbmem/cbmem.c @@ -165,7 +165,9 @@ static void *map_memory_size(u64 physical, size_t size, uint8_t abort_on_failure v = mmap(NULL, size, PROT_READ, MAP_SHARED, mem_fd, p); - if (v == MAP_FAILED) { + /* Only try growing down when address exceeds page size so that + one doesn't underflow the offset request. */ + if (v == MAP_FAILED && p >= page) { /* The mapped area may have overrun the upper cbmem boundary when trying to * align to the page size. Try growing down instead of up... */ |