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powerpc/nvram: Handle partition names >= 12 chars

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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>
This commit is contained in:
Jim Keniston 2010-11-11 18:54:27 +00:00 committed by Benjamin Herrenschmidt
parent 690d1a9bd1
commit 6024ede9ba
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/kernel/nvram_64.c
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@ -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) {