summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--util/cbmem/cbmem.c4
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...
*/