um: virtio: Replace zero-length array with flexible-array

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]

sizeof(flexible-array-member) triggers a warning because flexible array
members have incomplete type[1]. There are some instances of code in
which the sizeof operator is being incorrectly/erroneously applied to
zero-length arrays and the result is zero. Such instances may be hiding
some bugs. So, this work (flexible-array member conversions) will also
help to get completely rid of those sorts of issues.

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 <gustavoars@kernel.org>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/arch/um/drivers/vector_kern.h b/arch/um/drivers/vector_kern.h
index d0159082faf0527b127d939af4d9d7eefd42fa2d..8fff93a75a927e0d69cd8528ada8d8616ac78151 100644 (file)
--- a/arch/um/drivers/vector_kern.h
+++ b/arch/um/drivers/vector_kern.h
@@ -129,7 +129,7 @@ struct vector_private {
        struct vector_estats estats;
        struct sock_fprog *bpf;
 
-       char user[0];
+       char user[];
 };
 
 extern int build_transport_data(struct vector_private *vp);

diff --git a/arch/um/drivers/vhost_user.h b/arch/um/drivers/vhost_user.h
index 6c71b600517746c7309197ea87eb3089666d3210..6f147cd3c9f76a81995a8229c6eac01c1f8c5227 100644 (file)
--- a/arch/um/drivers/vhost_user.h
+++ b/arch/um/drivers/vhost_user.h
@@ -78,7 +78,7 @@ struct vhost_user_config {
        u32 offset;
        u32 size;
        u32 flags;
-       u8 payload[0]; /* Variable length */
+       u8 payload[]; /* Variable length */
 } __packed;
 
 struct vhost_user_vring_state {