[PATCH] profile: fix stats and data leakage

[Hugh Dickins]

If the kernel is large or the profiling step small, /proc/profile
leaks data and readprofile shows silly stats, until readprofile -r
has reset the buffer: clear the prof_buffer when it is vmalloc()ed.

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: stable@xxxxxxxxxx
---

 kernel/profile.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 2.6.34-rc7/kernel/profile.c	2009-12-02 19:51:21.000000000 -0800
+++ linux/kernel/profile.c	2010-05-13 14:57:37.000000000 -0700
@@ -127,8 +127,10 @@ int __ref profile_init(void)
 		return 0;
 
 	prof_buffer = vmalloc(buffer_bytes);
-	if (prof_buffer)
+	if (prof_buffer) {
+		memset(prof_buffer, 0, buffer_bytes);
 		return 0;
+	}
 
 	free_cpumask_var(prof_cpu_mask);
 	return -ENOMEM;
--
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