From: Denis Kirjanov <dkirjanov@hera.kernel.org>
Date: Tue, 1 Jun 2010 19:43:34 +0000 (-0400)
Subject: powerpc/oprofile: fix potential buffer overrun in op_model_cell.c
X-Git-Tag: firefly_0821_release~10186^2~1526
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=63592befd6212caabbe5f9517f64049d55ec67fb;p=firefly-linux-kernel-4.4.55.git

powerpc/oprofile: fix potential buffer overrun in op_model_cell.c

commit 238c1a78c957f3dc7cb848b161dcf4805793ed56 upstream.

Fix potential initial_lfsr buffer overrun.
Writing past the end of the buffer could happen when index == ENTRIES

Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/powerpc/oprofile/op_model_cell.c b/arch/powerpc/oprofile/op_model_cell.c
index ae06c6236d9c..c8fc4dc8f572 100644
--- a/arch/powerpc/oprofile/op_model_cell.c
+++ b/arch/powerpc/oprofile/op_model_cell.c
@@ -1077,7 +1077,7 @@ static int calculate_lfsr(int n)
 		index = ENTRIES-1;
 
 	/* make sure index is valid */
-	if ((index > ENTRIES) || (index < 0))
+	if ((index >= ENTRIES) || (index < 0))
 		index = ENTRIES-1;
 
 	return initial_lfsr[index];