Commit 7593f4c5 authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva Committed by David Sterba

btrfs: rcu-string: 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 76497732 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: default avatarGustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 17b238ac
...@@ -8,7 +8,7 @@ ...@@ -8,7 +8,7 @@
struct rcu_string { struct rcu_string {
struct rcu_head rcu; struct rcu_head rcu;
char str[0]; char str[];
}; };
static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask) static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
......
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