linux-kernel - [PATCH 5/6] sound/core/pcm_compat.c: adjust array index

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Message-Id: <1311857165-14780-6-git-send-email-julia@diku.dk>
Date:	Thu, 28 Jul 2011 14:46:05 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Jaroslav Kysela <perex@...ex.cz>
Cc:	kernel-janitors@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] sound/core/pcm_compat.c: adjust array index

From: Julia Lawall <julia@...u.dk>

Convert array index from the loop bound to the loop index.

A simplified version of the semantic patch that fixes this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e1,e2,ar;
@@

for(e1 = 0; e1 < e2; e1++) { <...
  ar[
- e2
+ e1
  ]
  ...> }
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
Not tested.

 sound/core/pcm_compat.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -342,7 +342,7 @@ static int snd_pcm_ioctl_xfern_compat(st
 			kfree(bufs);
 			return -EFAULT;
 		}
-		bufs[ch] = compat_ptr(ptr);
+		bufs[i] = compat_ptr(ptr);
 		bufptr++;
 	}
 	if (dir == SNDRV_PCM_STREAM_PLAYBACK)

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