mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 10:29:37 +00:00
wl3501_cs: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293
("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200319230617.GA15035@embeddedor.com
This commit is contained in:
parent
0562ebcf05
commit
53efdc9cb9
1 changed files with 1 additions and 1 deletions
|
@ -231,7 +231,7 @@ struct iw_mgmt_info_element {
|
|||
u8 id; /* one of enum iw_mgmt_info_element_ids,
|
||||
but sizeof(enum) > sizeof(u8) :-( */
|
||||
u8 len;
|
||||
u8 data[0];
|
||||
u8 data[];
|
||||
} __packed;
|
||||
|
||||
struct iw_mgmt_essid_pset {
|
||||
|
|
Loading…
Reference in a new issue