cgroups: add check for strcpy destination string overflow

Function "strcpy" is used without check for maximum allowed source string
length and could cause destination string overflow.  Check for string
length is added before using "strcpy".  Function now is return error if
source string length is more than a maximum.

akpm: presently considered NotABug, but add the check for general
future-safeness and robustness.

Signed-off-by: Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@nokia.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 3e6517e51fd3..5cf366965d0c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1922,6 +1922,8 @@ static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft,
                                       const char *buffer)
 {
         BUILD_BUG_ON(sizeof(cgrp->root->release_agent_path) < PATH_MAX);
+        if (strlen(buffer) >= PATH_MAX)
+                return -EINVAL;
         if (!cgroup_lock_live_group(cgrp))
                 return -ENODEV;
         strcpy(cgrp->root->release_agent_path, buffer);