]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
lib/ts_bm.c: replace zero-length array with flexible-array member
authorGustavo A. R. Silva <gustavo@embeddedor.com>
Tue, 7 Apr 2020 03:10:00 +0000 (20:10 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 7 Apr 2020 17:43:42 +0000 (10:43 -0700)
commitc6e2ac3b476b458f9bd2069d85b95ca4634ce680
treef8225e10a69bae399c9c7f7b5685b02080029b8f
parenta44ce5137026493b3bec3768cff92861dbeede5c
lib/ts_bm.c: 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
inadvertenly introduced[3] to the codebase from now on.

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: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200211205620.GA24694@embeddedor
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/ts_bm.c