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-rw-r--r--mm/mempolicy.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 143b019e9834..3c8ee31572ec 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1965,6 +1965,11 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
unsigned short mode;
unsigned short flags = pol ? pol->flags : 0;
+ /*
+ * Sanity check: room for longest mode, flag and some nodes
+ */
+ VM_BUG_ON(maxlen < strlen("interleave") + strlen("relative") + 16);
+
if (!pol || pol == &default_policy)
mode = MPOL_DEFAULT;
else
@@ -1991,7 +1996,6 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
default:
BUG();
- return -EFAULT;
}
l = strlen(policy_types[mode]);
@@ -2002,16 +2006,17 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
p += l;
if (flags & MPOL_MODE_FLAGS) {
- int need_bar = 0;
-
if (buffer + maxlen < p + 2)
return -ENOSPC;
*p++ = '=';
+ /*
+ * Currently, the only defined flags are mutually exclusive
+ */
if (flags & MPOL_F_STATIC_NODES)
- p += sprintf(p, "%sstatic", need_bar++ ? "|" : "");
- if (flags & MPOL_F_RELATIVE_NODES)
- p += sprintf(p, "%srelative", need_bar++ ? "|" : "");
+ p += snprintf(p, buffer + maxlen - p, "static");
+ else if (flags & MPOL_F_RELATIVE_NODES)
+ p += snprintf(p, buffer + maxlen - p, "relative");
}
if (!nodes_empty(nodes)) {