Nouveau - Feb 2018 - [PATCH] drm: nouveau: use larger buffer in nvif_vmm_map

gcc points out a buffer that is clearly too small to be used
in a meaningful way, as the 'sizeof(*args) + argc > sizeof(stack)'
will always fail:

In function 'memcpy',
    inlined from 'nvif_vmm_map' at
drivers/gpu/drm/nouveau/nvif/vmm.c:55:2:
include/linux/string.h:353:9: error: '__builtin_memcpy' offset 40 is out
of the bounds [0, 16] of object 'stack' with type 'u8[16]' {aka
'unsigned char[16]'} [-Werror=array-bounds]
  return __builtin_memcpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/nouveau/nvif/vmm.c: In function 'nvif_vmm_map':
drivers/gpu/drm/nouveau/nvif/vmm.c:40:5: note: 'stack' declared here

This makes the buffer large enough so it should serve the purpose
that the author presumably had in mind. Alternatively we could
just get rid of it completely and simplify the code at the cost
of always doing the kmalloc (as we do in the current version).

Fixes: 920d2b5ef215 ("drm/nouveau/mmu: define user interfaces to mmu vmm
opertaions")
Signed-off-by: Arnd Bergmann <arnd at arndb.de>
---
Cc: Martin Sebor <msebor at gcc.gnu.org>

Martin: this one is interesting, I think it qualifies as a
false-positive warning that gcc should not print because there
is no overflow, but the code is still wrong because we never
copy into the fixed-size buffer that was intended as a
micro-optimization
---
 drivers/gpu/drm/nouveau/nvif/vmm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvif/vmm.c
b/drivers/gpu/drm/nouveau/nvif/vmm.c
index 31cdb2d2e1ff..191832be6c65 100644
--- a/drivers/gpu/drm/nouveau/nvif/vmm.c
+++ b/drivers/gpu/drm/nouveau/nvif/vmm.c
@@ -37,7 +37,7 @@ nvif_vmm_map(struct nvif_vmm *vmm, u64 addr, u64 size, void
*argv, u32 argc,
 	     struct nvif_mem *mem, u64 offset)
 {
 	struct nvif_vmm_map_v0 *args;
-	u8 stack[16];
+	u8 stack[48];
 	int ret;
 
 	if (sizeof(*args) + argc > sizeof(stack)) {
-- 
2.9.0