diff options
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index af20ca22bf..9ae5b6ef24 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -2013,12 +2013,22 @@ new_heap(size) size_t size; mapping (on Linux, this is the case for all non-writable mappings anyway). */ p1 = (char *)MMAP(0, HEAP_MAX_SIZE<<1, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE); - if(p1 == MAP_FAILED) - return 0; - p2 = (char *)(((unsigned long)p1 + HEAP_MAX_SIZE) & ~(HEAP_MAX_SIZE-1)); - ul = p2 - p1; - munmap(p1, ul); - munmap(p2 + HEAP_MAX_SIZE, HEAP_MAX_SIZE - ul); + if(p1 != MAP_FAILED) { + p2 = (char *)(((unsigned long)p1 + HEAP_MAX_SIZE) & ~(HEAP_MAX_SIZE-1)); + ul = p2 - p1; + munmap(p1, ul); + munmap(p2 + HEAP_MAX_SIZE, HEAP_MAX_SIZE - ul); + } else { + /* Try to take the chance that an allocation of only HEAP_MAX_SIZE + is already aligned. */ + p2 = (char *)MMAP(0, HEAP_MAX_SIZE, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE); + if(p2 == MAP_FAILED) + return 0; + if((unsigned long)p2 & (HEAP_MAX_SIZE-1)) { + munmap(p2, HEAP_MAX_SIZE); + return 0; + } + } if(mprotect(p2, size, PROT_READ|PROT_WRITE) != 0) { munmap(p2, HEAP_MAX_SIZE); return 0; |