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From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Oded Gabbay <ogabbay@kernel.org>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	linux-hardening@vger.kernel.org
Subject: [PATCH][next] habanalabs: Replace zero-length arrays with flexible-array members
Date: Mon, 9 Jan 2023 19:39:47 -0600	[thread overview]
Message-ID: <Y7zB4z5cxpFkPXKV@work> (raw)

Zero-length arrays are deprecated[1] and we are moving towards
adopting C99 flexible-array members instead. So, replace zero-length
arrays in a couple of structures with flex-array members.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [2].

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h b/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h
index 8bf90fc18bf5..a812f8503f90 100644
--- a/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h
+++ b/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h
@@ -59,7 +59,7 @@ struct gaudi2_packet {
 	/* The rest of the packet data follows. Use the corresponding
 	 * packet_XXX struct to deference the data, based on packet type
 	 */
-	u8 contents[0];
+	u8 contents[];
 };
 
 struct packet_nop {
@@ -80,7 +80,7 @@ struct packet_wreg32 {
 struct packet_wreg_bulk {
 	__le32 size64;
 	__le32 ctl;
-	__le64 values[0]; /* data starts here */
+	__le64 values[]; /* data starts here */
 };
 
 struct packet_msg_long {
-- 
2.34.1


WARNING: multiple messages have this Message-ID (diff)
From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Oded Gabbay <ogabbay@kernel.org>
Cc: linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>
Subject: [PATCH][next] habanalabs: Replace zero-length arrays with flexible-array members
Date: Mon, 9 Jan 2023 19:39:47 -0600	[thread overview]
Message-ID: <Y7zB4z5cxpFkPXKV@work> (raw)

Zero-length arrays are deprecated[1] and we are moving towards
adopting C99 flexible-array members instead. So, replace zero-length
arrays in a couple of structures with flex-array members.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [2].

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h b/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h
index 8bf90fc18bf5..a812f8503f90 100644
--- a/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h
+++ b/drivers/accel/habanalabs/include/gaudi2/gaudi2_packets.h
@@ -59,7 +59,7 @@ struct gaudi2_packet {
 	/* The rest of the packet data follows. Use the corresponding
 	 * packet_XXX struct to deference the data, based on packet type
 	 */
-	u8 contents[0];
+	u8 contents[];
 };
 
 struct packet_nop {
@@ -80,7 +80,7 @@ struct packet_wreg32 {
 struct packet_wreg_bulk {
 	__le32 size64;
 	__le32 ctl;
-	__le64 values[0]; /* data starts here */
+	__le64 values[]; /* data starts here */
 };
 
 struct packet_msg_long {
-- 
2.34.1


             reply	other threads:[~2023-01-10  1:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-10  1:39 Gustavo A. R. Silva [this message]
2023-01-10  1:39 ` [PATCH][next] habanalabs: Replace zero-length arrays with flexible-array members Gustavo A. R. Silva
2023-01-10 10:46 ` Stanislaw Gruszka
2023-01-10 10:46   ` Stanislaw Gruszka
2023-01-10 13:34   ` Oded Gabbay
2023-01-10 13:34     ` Oded Gabbay

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