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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-26 16:27:22 -0600
committerMiquel Raynal <miquel.raynal@bootlin.com>2020-03-11 16:17:54 +0100
commit49f1c33076ca56871ffddc4800b04524204ea889 (patch)
treedaa5aa45f8538c85b95dd1479f8358131c961b26 /drivers/mtd/nand/raw/meson_nand.c
parentc6fbcb70132ffc66696a94dd3d8e6215c750254f (diff)
downloadlinux-49f1c33076ca56871ffddc4800b04524204ea889.tar.bz2
mtd: rawnand: 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> Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20200226222722.GA18020@embeddedor
Diffstat (limited to 'drivers/mtd/nand/raw/meson_nand.c')
-rw-r--r--drivers/mtd/nand/raw/meson_nand.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index 9f17b5b8efbf..f6fb5c0e6255 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -118,7 +118,7 @@ struct meson_nfc_nand_chip {
u8 *data_buf;
__le64 *info_buf;
u32 nsels;
- u8 sels[0];
+ u8 sels[];
};
struct meson_nand_ecc {