linux-hardening - [PATCH][next] staging: r8188eu: Replace zero-length array with flexible-array member

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Message-ID: <20210929193658.GA339070@embeddedor>
Date:   Wed, 29 Sep 2021 14:36:58 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] staging: r8188eu: Replace zero-length array with
 flexible-array member

One-element and zero-length arrays are deprecated and should be
replaced with flexible-array members[1].

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kmalloc().

[1] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/staging/r8188eu/include/osdep_service.h | 2 +-
 drivers/staging/r8188eu/os_dep/osdep_service.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/r8188eu/include/osdep_service.h b/drivers/staging/r8188eu/include/osdep_service.h
index da85a9681c4a..4622ce400e41 100644
--- a/drivers/staging/r8188eu/include/osdep_service.h
+++ b/drivers/staging/r8188eu/include/osdep_service.h
@@ -289,7 +289,7 @@ struct rtw_cbuf {
 	u32 write;
 	u32 read;
 	u32 size;
-	void *bufs[0];
+	void *bufs[];
 };
 
 bool rtw_cbuf_empty(struct rtw_cbuf *cbuf);
diff --git a/drivers/staging/r8188eu/os_dep/osdep_service.c b/drivers/staging/r8188eu/os_dep/osdep_service.c
index 002c75f16725..d7d03c1417fd 100644
--- a/drivers/staging/r8188eu/os_dep/osdep_service.c
+++ b/drivers/staging/r8188eu/os_dep/osdep_service.c
@@ -262,7 +262,7 @@ struct rtw_cbuf *rtw_cbuf_alloc(u32 size)
 {
 	struct rtw_cbuf *cbuf;
 
-	cbuf = kmalloc(sizeof(*cbuf) + sizeof(void *) * size, GFP_KERNEL);
+	cbuf = kmalloc(struct_size(cbuf, bufs, size), GFP_KERNEL);
 
 	if (cbuf) {
 		cbuf->write = 0;
-- 
2.27.0