diff options
| author | Cao jin <caoj.fnst@cn.fujitsu.com> | 2016-11-02 21:44:46 +0800 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2017-01-24 23:26:53 +0300 |
| commit | 4a3ecf201a1a49a804e8506df5906e446707c3b1 (patch) | |
| tree | 834cc87622ce0b09b0b92898d5eb4e02105a5424 /util/mmap-alloc.c | |
| parent | 8907379204807b8047e710ae76c4d6849c3f6ce1 (diff) | |
| download | qemu-4a3ecf201a1a49a804e8506df5906e446707c3b1.zip qemu-4a3ecf201a1a49a804e8506df5906e446707c3b1.tar.gz qemu-4a3ecf201a1a49a804e8506df5906e446707c3b1.tar.bz2 | |
util/mmap-alloc: check parameter before using
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'util/mmap-alloc.c')
| -rw-r--r-- | util/mmap-alloc.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index 5a85aa3..d713a72 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -12,6 +12,7 @@ #include "qemu/osdep.h" #include "qemu/mmap-alloc.h" +#include "qemu/host-utils.h" #define HUGETLBFS_MAGIC 0x958458f6 @@ -61,18 +62,18 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared) #else void *ptr = mmap(0, total, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); #endif - size_t offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr; + size_t offset; void *ptr1; if (ptr == MAP_FAILED) { return MAP_FAILED; } - /* Make sure align is a power of 2 */ - assert(!(align & (align - 1))); + assert(is_power_of_2(align)); /* Always align to host page size */ assert(align >= getpagesize()); + offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr; ptr1 = mmap(ptr + offset, size, PROT_READ | PROT_WRITE, MAP_FIXED | (fd == -1 ? MAP_ANONYMOUS : 0) | |