powerpc/nvram: Handle partition names >= 12 chars

The name field in the nvram_header can be < 12 chars, null-terminated,
or 12 chars without the null.  Handle this safely.

Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index b8a50fa5875b..bb12b3248f13 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -42,6 +42,7 @@ struct nvram_header {
         unsigned char signature;
         unsigned char checksum;
         unsigned short length;
+        /* Terminating null required only for names < 12 chars. */
         char name[12];
 };
 
@@ -201,7 +202,7 @@ static void __init nvram_print_partitions(char * label)
         printk(KERN_WARNING "--------%s---------\n", label);
         printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
         list_for_each_entry(tmp_part, &nvram_partitions, partition) {
-                printk(KERN_WARNING "%4d    \t%02x\t%02x\t%d\t%s\n",
+                printk(KERN_WARNING "%4d    \t%02x\t%02x\t%d\t%12s\n",
                        tmp_part->index, tmp_part->header.signature,
                        tmp_part->header.checksum, tmp_part->header.length,
                        tmp_part->header.name);
@@ -256,7 +257,7 @@ int __init nvram_remove_partition(const char *name, int sig)
 
                 /* Make partition a free partition */
                 part->header.signature = NVRAM_SIG_FREE;
-                sprintf(part->header.name, "wwwwwwwwwwww");
+                strncpy(part->header.name, "wwwwwwwwwwww", 12);
                 part->header.checksum = nvram_checksum(&part->header);
                 rc = nvram_write_header(part);
                 if (rc <= 0) {