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From: Arnd Bergmann <arnd@arndb.de>
To: linux-kernel@vger.kernel.org, Kalle Valo <kvalo@codeaurora.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	Michal Kazior <michal.kazior@tieto.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Kalle Valo <kvalo@qca.qualcomm.com>,
	Maharaja Kennadyrajan <mkenna@codeaurora.org>,
	Wen Gong <wgong@codeaurora.org>,
	Erik Stromdahl <erik.stromdahl@gmail.com>,
	ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
	netdev@vger.kernel.org
Subject: [PATCH 04/15] ath10k: fix gcc-10 zero-length-bounds warnings
Date: Thu, 30 Apr 2020 23:30:46 +0200	[thread overview]
Message-ID: <20200430213101.135134-5-arnd@arndb.de> (raw)
In-Reply-To: <20200430213101.135134-1-arnd@arndb.de>

gcc-10 started warning about out-of-bounds access for zero-length
arrays:

In file included from drivers/net/wireless/ath/ath10k/core.h:18,
                 from drivers/net/wireless/ath/ath10k/htt_rx.c:8:
drivers/net/wireless/ath/ath10k/htt_rx.c: In function 'ath10k_htt_rx_tx_fetch_ind':
drivers/net/wireless/ath/ath10k/htt.h:1683:17: warning: array subscript 65535 is outside the bounds of an interior zero-length array 'struct htt_tx_fetch_record[0]' [-Wzero-length-bounds]
 1683 |  return (void *)&ind->records[le16_to_cpu(ind->num_records)];
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/wireless/ath/ath10k/htt.h:1676:29: note: while referencing 'records'
 1676 |  struct htt_tx_fetch_record records[0];
      |                             ^~~~~~~

The structure was already converted to have a flexible-array member in
the past, but there are two zero-length members in the end and only
one of them can be a flexible-array member.

Swap the two around to avoid the warning, as 'resp_ids' is not accessed
in a way that causes a warning.

Fixes: 3ba225b506a2 ("treewide: Replace zero-length array with flexible-array member")
Fixes: 22e6b3bc5d96 ("ath10k: add new htt definitions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/ath/ath10k/htt.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h
index e7096a73c6ca..7621f0a3dc77 100644
--- a/drivers/net/wireless/ath/ath10k/htt.h
+++ b/drivers/net/wireless/ath/ath10k/htt.h
@@ -1673,8 +1673,8 @@ struct htt_tx_fetch_ind {
 	__le32 token;
 	__le16 num_resp_ids;
 	__le16 num_records;
-	struct htt_tx_fetch_record records[0];
-	__le32 resp_ids[]; /* ath10k_htt_get_tx_fetch_ind_resp_ids() */
+	__le32 resp_ids[0]; /* ath10k_htt_get_tx_fetch_ind_resp_ids() */
+	struct htt_tx_fetch_record records[];
 } __packed;
 
 static inline void *
-- 
2.26.0


WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: linux-kernel@vger.kernel.org, Kalle Valo <kvalo@codeaurora.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	Michal Kazior <michal.kazior@tieto.com>
Cc: Maharaja Kennadyrajan <mkenna@codeaurora.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Erik Stromdahl <erik.stromdahl@gmail.com>,
	netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
	ath10k@lists.infradead.org, Kalle Valo <kvalo@qca.qualcomm.com>,
	Wen Gong <wgong@codeaurora.org>
Subject: [PATCH 04/15] ath10k: fix gcc-10 zero-length-bounds warnings
Date: Thu, 30 Apr 2020 23:30:46 +0200	[thread overview]
Message-ID: <20200430213101.135134-5-arnd@arndb.de> (raw)
In-Reply-To: <20200430213101.135134-1-arnd@arndb.de>

gcc-10 started warning about out-of-bounds access for zero-length
arrays:

In file included from drivers/net/wireless/ath/ath10k/core.h:18,
                 from drivers/net/wireless/ath/ath10k/htt_rx.c:8:
drivers/net/wireless/ath/ath10k/htt_rx.c: In function 'ath10k_htt_rx_tx_fetch_ind':
drivers/net/wireless/ath/ath10k/htt.h:1683:17: warning: array subscript 65535 is outside the bounds of an interior zero-length array 'struct htt_tx_fetch_record[0]' [-Wzero-length-bounds]
 1683 |  return (void *)&ind->records[le16_to_cpu(ind->num_records)];
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/wireless/ath/ath10k/htt.h:1676:29: note: while referencing 'records'
 1676 |  struct htt_tx_fetch_record records[0];
      |                             ^~~~~~~

The structure was already converted to have a flexible-array member in
the past, but there are two zero-length members in the end and only
one of them can be a flexible-array member.

Swap the two around to avoid the warning, as 'resp_ids' is not accessed
in a way that causes a warning.

Fixes: 3ba225b506a2 ("treewide: Replace zero-length array with flexible-array member")
Fixes: 22e6b3bc5d96 ("ath10k: add new htt definitions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/ath/ath10k/htt.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h
index e7096a73c6ca..7621f0a3dc77 100644
--- a/drivers/net/wireless/ath/ath10k/htt.h
+++ b/drivers/net/wireless/ath/ath10k/htt.h
@@ -1673,8 +1673,8 @@ struct htt_tx_fetch_ind {
 	__le32 token;
 	__le16 num_resp_ids;
 	__le16 num_records;
-	struct htt_tx_fetch_record records[0];
-	__le32 resp_ids[]; /* ath10k_htt_get_tx_fetch_ind_resp_ids() */
+	__le32 resp_ids[0]; /* ath10k_htt_get_tx_fetch_ind_resp_ids() */
+	struct htt_tx_fetch_record records[];
 } __packed;
 
 static inline void *
-- 
2.26.0


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  parent reply	other threads:[~2020-04-30 21:32 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-30 21:30 [PATCH 00/15] gcc-10 warning fixes Arnd Bergmann
2020-04-30 21:30 ` Arnd Bergmann
2020-04-30 21:30 ` Arnd Bergmann
2020-04-30 21:30 ` [PATCH 01/15] crypto - Avoid free() namespace collision Arnd Bergmann
2020-05-08  6:06   ` Herbert Xu
2020-04-30 21:30 ` [PATCH 02/15] iwlwifi: mvm: fix gcc-10 zero-length-bounds warning Arnd Bergmann
2020-06-10 12:18   ` Luciano Coelho
2020-04-30 21:30 ` [PATCH 03/15] mwifiex: avoid -Wstringop-overflow warning Arnd Bergmann
2020-05-06  8:43   ` Kalle Valo
2020-04-30 21:30 ` Arnd Bergmann [this message]
2020-04-30 21:30   ` [PATCH 04/15] ath10k: fix gcc-10 zero-length-bounds warnings Arnd Bergmann
2020-04-30 21:45   ` Gustavo A. R. Silva
2020-04-30 21:45     ` Gustavo A. R. Silva
2020-04-30 21:44     ` Arnd Bergmann
2020-04-30 21:44       ` Arnd Bergmann
2020-05-04 11:54     ` Kalle Valo
2020-05-04 11:54       ` Kalle Valo
2020-05-04 16:09       ` Gustavo A. R. Silva
2020-05-04 16:09         ` Gustavo A. R. Silva
2020-05-05  4:56         ` Kalle Valo
2020-05-05  4:56           ` Kalle Valo
2020-04-30 21:30 ` [PATCH 05/15] bpf: avoid gcc-10 stringop-overflow warning Arnd Bergmann
2020-05-04 21:06   ` Daniel Borkmann
2020-04-30 21:30 ` [PATCH 06/15] netfilter: conntrack: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-05-10 21:48   ` Pablo Neira Ayuso
2020-04-30 21:30 ` [PATCH 07/15] drop_monitor: work around gcc-10 stringop-overflow warning Arnd Bergmann
2020-05-01 11:28   ` Neil Horman
2020-04-30 21:30 ` [PATCH 08/15] usb: ehci: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-05-01  2:42   ` Alan Stern
2020-05-01 20:06     ` Arnd Bergmann
2020-05-01 20:10       ` Alan Stern
2020-04-30 21:30 ` [PATCH 09/15] udf: avoid gcc-10 zero-length-bounds warnings Arnd Bergmann
2020-04-30 21:54   ` Pali Rohár
2020-05-01 20:30     ` Arnd Bergmann
2020-05-01 20:48       ` Jan Kara
2020-05-01 20:57       ` Pali Rohár
2020-04-30 21:30 ` [PATCH 10/15] hpfs: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-04-30 21:30 ` [PATCH 11/15] omfs: avoid gcc-10 stringop-overflow warning Arnd Bergmann
2020-04-30 21:30 ` [PATCH 12/15] media: s5k5baf: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-04-30 21:46   ` Gustavo A. R. Silva
2020-04-30 21:30 ` [PATCH 13/15] scsi: sas: " Arnd Bergmann
2020-05-01  7:47   ` John Garry
2020-05-01  7:54     ` Arnd Bergmann
2020-05-01 14:53       ` James Bottomley
2020-05-01 17:36         ` Arnd Bergmann
2020-04-30 21:30 ` [PATCH 14/15] isci: " Arnd Bergmann
2020-04-30 21:30 ` [PATCH 15/15] nvme: " Arnd Bergmann
2020-04-30 21:30   ` Arnd Bergmann
2020-05-01  7:32   ` Christoph Hellwig
2020-05-01  7:32     ` Christoph Hellwig

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