From: Lepton Wu Date: Fri, 14 Aug 2020 02:14:13 +0000 (-0700) Subject: util/ralloc: fix ralloc alignment. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a4c708dd24e5ba8ac381973c14db8d23f4ac97bf;p=mesa.git util/ralloc: fix ralloc alignment. On some malloc implementation, malloc doesn't always align to 16 bytes even on 64 bits system. To make sure ralloc_header always starts at the wanted alignment, just force the size to be aligned at the alignment of ralloc_header. This fixes crashed on instruction like "movaps %xmm0,0x10(%rax)" which requires aligned memory access. Signed-off-by: Lepton Wu Reviewed-by: Marek Olšák Part-of: --- diff --git a/src/util/ralloc.c b/src/util/ralloc.c index f36f8bf3654..4c2cf0772ce 100644 --- a/src/util/ralloc.c +++ b/src/util/ralloc.c @@ -28,6 +28,9 @@ #include #include +#include "util/macros.h" +#include "util/u_math.h" + /* Some versions of MinGW are missing _vscprintf's declaration, although they * still provide the symbol in the import library. */ #ifdef __MINGW32__ @@ -120,7 +123,15 @@ ralloc_context(const void *ctx) void * ralloc_size(const void *ctx, size_t size) { - void *block = malloc(size + sizeof(ralloc_header)); + /* Some malloc allocation doesn't always align to 16 bytes even on 64 bits + * system, from Android bionic/tests/malloc_test.cpp: + * - Allocations of a size that rounds up to a multiple of 16 bytes + * must have at least 16 byte alignment. + * - Allocations of a size that rounds up to a multiple of 8 bytes and + * not 16 bytes, are only required to have at least 8 byte alignment. + */ + void *block = malloc(align64(size + sizeof(ralloc_header), + alignof(ralloc_header))); ralloc_header *info; ralloc_header *parent; @@ -167,7 +178,8 @@ resize(void *ptr, size_t size) ralloc_header *child, *old, *info; old = get_header(ptr); - info = realloc(old, size + sizeof(ralloc_header)); + info = realloc(old, align64(size + sizeof(ralloc_header), + alignof(ralloc_header))); if (info == NULL) return NULL;