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mm: fix off-by-one bug in print_nodes_state()

Browse source 
/sys/devices/system/node/{online,possible} outputs a garbage byte
because print_nodes_state() returns content size + 1.  To fix the bug,
the patch changes the use of cpuset_sprintf_cpulist to follow the use at
other places, which is clearer and safer.

This bug was introduced in v2.6.24 (commit bde631a518: "mm: add node
states sysfs class attributeS").

Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ryota Ozaki 2012-05-29 15:06:20 -07:00 committed by Linus Torvalds
parent 23b9da55c5
commit f623881872
1 changed files with 3 additions and 5 deletions
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8
drivers/base/node.c
View file

@ -592,11 +592,9 @@ static ssize_t print_nodes_state(enum node_states state, char *buf)
{
int n;
n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
if (n > 0 && PAGE_SIZE > n + 1) {
*(buf + n++) = '\n';
*(buf + n++) = '\0';
}
n = nodelist_scnprintf(buf, PAGE_SIZE-2, node_states[state]);
buf[n++] = '\n';
buf[n] = '\0';
return n;
}