Subject: [PATCH v3] ath9k: dfs: Remove VLA usage

From: Kees Cook <[email-masked]>
Date: Tue, 24 Apr 2018 16:57:52 -0700

In the quest to remove all stack VLA usage from the kernel[1], this
redefines FFT_NUM_SAMPLES as a #define instead of const int, which still
triggers gcc's VLA checking pass.

[1] https://lkml.org/lkml/2018/3/7/621

Co-developed-by: Andreas Christoforou <[email-masked]>
Signed-off-by: Kees Cook <[email-masked]>
---
v3: replace FFT_NUM_SAMPLES as a #define (Joe)
---
 drivers/net/wireless/ath/ath9k/dfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
index 6fee9a464cce..e6e56a925121 100644
--- a/drivers/net/wireless/ath/ath9k/dfs.c
+++ b/drivers/net/wireless/ath/ath9k/dfs.c
@@ -40,8 +40,8 @@ static const int BIN_DELTA_MIN		= 1;
 static const int BIN_DELTA_MAX		= 10;
 
 /* we need at least 3 deltas / 4 samples for a reliable chirp detection */
-#define NUM_DIFFS 3
-static const int FFT_NUM_SAMPLES	= (NUM_DIFFS + 1);
+#define NUM_DIFFS	3
+#define FFT_NUM_SAMPLES	(NUM_DIFFS + 1)
 
 /* Threshold for difference of delta peaks */
 static const int MAX_DIFF		= 2;
-- 
2.7.4

-- 
Kees Cook
Pixel Security