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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-28 07:30:45 -0600
committerDavid S. Miller <davem@davemloft.net>2020-02-28 12:08:37 -0800
commitaf71b090c88c12816d43514190790de919921cea (patch)
tree12503a8b35ac1bfd3e186b704fab8406ff34361a /net/l2tp
parent680a93166e80e43e3ff85be06005c5cfa492d852 (diff)
l2tp: 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] Lastly, fix the following checkpatch warning: CHECK: Prefer kernel type 'u8' over 'uint8_t' #50: FILE: net/l2tp/l2tp_core.h:119: + uint8_t priv[]; /* private data */ 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: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp')
-rw-r--r--net/l2tp/l2tp_core.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 2db3d50d10a4..10cf7c3dcbb3 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -116,7 +116,7 @@ struct l2tp_session {
void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
void (*session_close)(struct l2tp_session *session);
void (*show)(struct seq_file *m, void *priv);
- uint8_t priv[0]; /* private data */
+ u8 priv[]; /* private data */
};
/* Describes the tunnel. It contains info to track all the associated