diff options
| -rw-r--r-- | mm/mempolicy.c | 17 |
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)) { |