linux-kernel - [PATCH 12/15] media: s5k5baf: avoid gcc-10 zero-length-bounds warning

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Message-Id: <20200430213101.135134-13-arnd@arndb.de>
Date:   Thu, 30 Apr 2020 23:30:54 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-kernel@...r.kernel.org,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Mauro Carvalho Chehab <m.chehab@...sung.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        linux-media@...r.kernel.org
Subject: [PATCH 12/15] media: s5k5baf: avoid gcc-10 zero-length-bounds warning

gcc-10 warns about accessing a zero-length struct member:

drivers/media/i2c/s5k5baf.c: In function 's5k5baf_load_setfile':
drivers/media/i2c/s5k5baf.c:390:13: warning: array subscript 65535 is outside the bounds of an interior zero-length array 'struct <anonymous>[0]' [-Wzero-length-bounds]
  390 |   if (f->seq[i].offset + d <= end)
      |       ~~~~~~^~~

This should really be a flexible-array member, but the structure
already has one. I experimentally confirmed that swapping the two
avoids the warning, as the 'data[]' array is not accessed like this.

Fixes: 3ba225b506a2 ("treewide: Replace zero-length array with flexible-array member")
Fixes: 7d459937dc09 ("[media] Add driver for Samsung S5K5BAF camera sensor")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/i2c/s5k5baf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/s5k5baf.c b/drivers/media/i2c/s5k5baf.c
index 42584a088273..0b1ddedcf7dc 100644
--- a/drivers/media/i2c/s5k5baf.c
+++ b/drivers/media/i2c/s5k5baf.c
@@ -277,11 +277,11 @@ enum {
 
 struct s5k5baf_fw {
 	u16 count;
+	u16 data[0];
 	struct {
 		u16 id;
 		u16 offset;
-	} seq[0];
-	u16 data[];
+	} seq[];
 };
 
 struct s5k5baf {
-- 
2.26.0