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Subject[PATCH 27/61] ALSA: Fix re-use of va_list
-stable review patch.  If anyone has any objections, please let us know.
------------------
From: Takashi Iwai <tiwai@suse.de>

[PATCH] ALSA: Fix re-use of va_list

The va_list is designed to be used only once. The current code
may pass va_list arguments multiple times and may cause Oops.
Copy/release the arguments temporarily to avoid this problem.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

---
sound/core/info.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- linux-2.6.18.1.orig/sound/core/info.c
+++ linux-2.6.18.1/sound/core/info.c
@@ -119,7 +119,10 @@ int snd_iprintf(struct snd_info_buffer *
len = buffer->len - buffer->size;
va_start(args, fmt);
for (;;) {
- res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, args);
+ va_list ap;
+ va_copy(ap, args);
+ res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
+ va_end(ap);
if (res < len)
break;
err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
--
-
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