From: Christoph Lameter Date: Sun, 24 Jun 2007 00:16:32 +0000 (-0700) Subject: SLUB: fix behavior if the text output of list_locations overflows PAGE_SIZE X-Git-Tag: v2.6.22-rc6~19 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=849663430268db63a9c3c7467984e4e530ded901;p=linux-2.6 SLUB: fix behavior if the text output of list_locations overflows PAGE_SIZE If slabs are allocated or freed from a large set of call sites (typical for the kmalloc area) then we may create more output than fits into a single PAGE and sysfs only gives us one page. The output should be truncated. This patch fixes the checks to do the truncation properly. Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/slub.c b/mm/slub.c index fa28b16236..202049a457 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3042,13 +3042,15 @@ static int list_locations(struct kmem_cache *s, char *buf, n += sprintf(buf + n, " pid=%ld", l->min_pid); - if (num_online_cpus() > 1 && !cpus_empty(l->cpus)) { + if (num_online_cpus() > 1 && !cpus_empty(l->cpus) && + n < PAGE_SIZE - 60) { n += sprintf(buf + n, " cpus="); n += cpulist_scnprintf(buf + n, PAGE_SIZE - n - 50, l->cpus); } - if (num_online_nodes() > 1 && !nodes_empty(l->nodes)) { + if (num_online_nodes() > 1 && !nodes_empty(l->nodes) && + n < PAGE_SIZE - 60) { n += sprintf(buf + n, " nodes="); n += nodelist_scnprintf(buf + n, PAGE_SIZE - n - 50, l->nodes);