uapi: linux: fiemap.h: 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 4287773bdd7a ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

diff --git a/include/uapi/linux/fiemap.h b/include/uapi/linux/fiemap.h
index 8c0bc24d5d95555754e6bfe56e0ba5543faa460d..7a900b2377b603df04f61461888566aa125fc061 100644 (file)
--- a/include/uapi/linux/fiemap.h
+++ b/include/uapi/linux/fiemap.h
@@ -34,7 +34,7 @@ struct fiemap {
        __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
        __u32 fm_extent_count;  /* size of fm_extents array (in) */
        __u32 fm_reserved;
-       struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
+       struct fiemap_extent fm_extents[]; /* array of mapped extents (out) */
 };
 
 #define FIEMAP_MAX_OFFSET      (~0ULL)