exportfs: don't assume that ->iterate() won't feed us too long entries

On some filesystems it's impossible even with fs corruption, but we'd
better not rely on that, what with memcpy() into on-stack array we
are doing there.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 293bc2e..a235f00 100644 (file)
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -231,7 +231,7 @@ static int filldir_one(void * __buf, const char * name, int len,
        int result = 0;
 
        buf->sequence++;
-       if (buf->ino == ino) {
+       if (buf->ino == ino && len <= NAME_MAX) {
                memcpy(buf->name, name, len);
                buf->name[len] = '\0';
                buf->found = 1;