linux-kernel - [PATCH] OSS: dmabuf: fix negative DMAbuf_get_buffer

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Date:	Thu, 17 Apr 2008 20:38:57 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] OSS: dmabuf: fix negative DMAbuf_get_buffer_pointer() check

Too late for OSS?
---
Since unsigned active_offs < 0 is even true when DMAbuf_get_buffer_pointer()
returns negative

Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
index eaf6997..1e90d76 100644
--- a/sound/oss/dmabuf.c
+++ b/sound/oss/dmabuf.c
@@ -795,9 +795,9 @@ static int find_output_space(int dev, char **buf, int *size)
 #ifdef BE_CONSERVATIVE
 	active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
 #else
-	active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
+	active_offs = max(DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT), 0);
 	/* Check for pointer wrapping situation */
-	if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
+	if (active_offs >= dmap->bytes_in_use)
 		active_offs = 0;
 	active_offs += dmap->byte_counter;
 #endif
--
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