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 2c9e52267292635570973ab97b9d03fe89606d95..7fd90d02d8c6d1917b53cfaaf5badb8818a076d7 100644 (file)
--- 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];