powerpc/pseries/lparcfg: Fix possible overflow are more than 1026

need set '\0' for 'local_buffer'.

SPLPAR_MAXLENGTH is 1026, RTAS_DATA_BUF_SIZE is 4096. so the contents of
rtas_data_buf may truncated in memcpy.

if contents are really truncated.
  the splpar_strlen is more than 1026. the next while loop checking will
  not find the end of buffer. that will cause memory access violation.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index f5725bce9ed29c55583b2805749a542628977698..ab297f492c678a304d075f1595d4db6fecada721 100644 (file)
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -301,6 +301,7 @@ static void parse_system_parameter_string(struct seq_file *m)
                                __pa(rtas_data_buf),
                                RTAS_DATA_BUF_SIZE);
        memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
+       local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
        spin_unlock(&rtas_data_buf_lock);
 
        if (call_status != 0) {