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author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-17 13:59:41 -0600 |
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committer | David S. Miller <davem@davemloft.net> | 2020-02-17 19:05:05 -0800 |
commit | 9814428a44d63bf77831afdbb37b5f0aab7394c9 (patch) | |
tree | af810f1e12f4308013f42642ecf535263ed6cb16 /net/core/sock_map.c | |
parent | dc3cc347d2ce77da41f120a6162b40c6139df754 (diff) | |
download | linux-9814428a44d63bf77831afdbb37b5f0aab7394c9.tar.bz2 |
NFC: digital: 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 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock_map.c')
0 files changed, 0 insertions, 0 deletions