linux-kernel - [PATCH v2 2/2] staging: r8188eu: Fix undersized array in rtw

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Date:   Sat, 28 May 2022 19:47:11 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     gregkh@...uxfoundation.org
Cc:     phil@...lpotter.co.uk, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Larry Finger <Larry.Finger@...inger.net>
Subject: [PATCH v2 2/2] staging: r8188eu: Fix undersized array in rtw_xmit.c

Compiling with -warray-bounds yields the following warning:

drivers/staging/r8188eu/core/rtw_xmit.c: In function ‘rtw_alloc_hwxmits’:
drivers/staging/r8188eu/core/rtw_xmit.c:1493:24: warning: array subscript 4 is outside array bounds of ‘void[64]’ [-Warray-bounds]
 1493 |                 hwxmits[4] .sta_queue = &pxmitpriv->be_pending;
      |                 ~~~~~~~^~~
In file included from drivers/staging/r8188eu/core/../include/osdep_service.h:19,
                 from drivers/staging/r8188eu/core/rtw_xmit.c:6:
In function ‘kmalloc’,
    inlined from ‘kzalloc’ at ./include/linux/slab.h:733:9,
    inlined from ‘rtw_alloc_hwxmits’ at drivers/staging/r8188eu/core/rtw_xmit.c:1484:23:
./include/linux/slab.h:600:24: note: at offset 64 into object of size 64 allocated by ‘kmem_cache_alloc_trace’
  600 |                 return kmem_cache_alloc_trace(
      |                        ^~~~~~~~~~~~~~~~~~~~~~~
  601 |                                 kmalloc_caches[kmalloc_type(flags)][index],
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  602 |                                 flags, size);
      |

This warning arises because macro HWXMIT_ENTRY is too small.

Fixes commit 7884fc0a1473 ("staging: r8188eu: introduce new include dir
for RTL8188eu driver")

Fixes: 7884fc0a1473 ("staging: r8188eu: introduce new include dir for RTL8188eu driver")
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Cc: Phillip Potter <phil@...lpotter.co.uk>
---
v2 = Get To and Cc right
---
 drivers/staging/r8188eu/include/rtw_xmit.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/include/rtw_xmit.h b/drivers/staging/r8188eu/include/rtw_xmit.h
index b2df1480d66b..27fa536f51ee 100644
--- a/drivers/staging/r8188eu/include/rtw_xmit.h
+++ b/drivers/staging/r8188eu/include/rtw_xmit.h
@@ -69,7 +69,7 @@ do {							\
 	dot11txpn.val = dot11txpn.val == 0xffffffffffffULL ? 0 : (dot11txpn.val+1);\
 } while (0)
 
-#define HWXMIT_ENTRY	4
+#define HWXMIT_ENTRY	5
 
 #define TXDESC_SIZE 32
 
-- 
2.36.1