GIT: unionfs2-2.6.27.y: powerpc/oprofile: fix potential buffer overrun in op_model_cell.c

[Erez Zadok]

commit 43bee391355ad45021579511963dfb46d6e810fb
Author: Denis Kirjanov <dkirjanov at hera.kernel.org>
Date:   Tue Jun 1 15:43:34 2010 -0400

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

diff --git a/arch/powerpc/oprofile/op_model_cell.c b/arch/powerpc/oprofile/op_model_cell.c
index 5ff4de3..303721d 100644
--- a/arch/powerpc/oprofile/op_model_cell.c
+++ b/arch/powerpc/oprofile/op_model_cell.c
@@ -821,7 +821,7 @@ 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];