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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-27 21:37:48 +0300
committerGeert Uytterhoeven <geert@linux-m68k.org>2020-03-09 13:12:19 +0300
commit573a73abc316ca6fe30fd52eaaf31c93077b2b23 (patch)
tree99f80003169564c7258694436ecd883354eca424
parentacc45648b9aefa903898ac857ec4d1dabcb2d4fe (diff)
downloadlinux-573a73abc316ca6fe30fd52eaaf31c93077b2b23.tar.xz
zorro: 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> Link: https://lore.kernel.org/r/20200227183748.GA31018@embeddedor Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
-rw-r--r--drivers/zorro/zorro.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/zorro/zorro.c b/drivers/zorro/zorro.c
index 8eeb84c239db..47c733817903 100644
--- a/drivers/zorro/zorro.c
+++ b/drivers/zorro/zorro.c
@@ -41,7 +41,7 @@ struct zorro_dev *zorro_autocon;
struct zorro_bus {
struct device dev;
- struct zorro_dev devices[0];
+ struct zorro_dev devices[];
};