On 6/20/20 1:27 PM, Sam Ravnborg wrote:
Hi Gustavo.
On Wed, Jun 17, 2020 at 12:56:47PM -0500, Gustavo A. R. Silva wrote:
quoted
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.
This code was detected with the help of Coccinelle and, audited and
fixed manually.
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
struct_size is defined in overflow.h - which is not included by fs.h.
So we rely on overflow.h being pulled in by some other header - maybe
slab.h in this case.
Seems fragile, should this patch add an include of overflow.h?
$ git grep struct_size drivers/|wc -l
697
$ git grep overflow\\.h drivers/|wc -l
8
$ git grep overflow\\.h include/linux/
include/linux/device.h:#include <linux/overflow.h>
include/linux/mm.h:#include <linux/overflow.h>
include/linux/slab.h:#include <linux/overflow.h>
include/linux/vmalloc.h:#include <linux/overflow.h>
so I've applied the patch as it is (hoping that the issue is so
widespread that no-one tries to remove overflow.h from slab.h
without fixing drivers at the same time)..
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
Sam
quoted
---
include/linux/fb.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 3b4b2f0c6994..2b530e6d86e4 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -506,8 +506,9 @@ struct fb_info {
};
static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {
- struct apertures_struct *a = kzalloc(sizeof(struct apertures_struct)
- + max_num * sizeof(struct aperture), GFP_KERNEL);
+ struct apertures_struct *a;
+
+ a = kzalloc(struct_size(a, ranges, max_num), GFP_KERNEL);
if (!a)
return NULL;
a->count = max_num;--
2.27.0
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