From 53f57fef43f5b9586c7a78acdeae27e206eae48b Mon Sep 17 00:00:00 2001 From: Mike Marshall Date: Mon, 14 Mar 2016 15:28:34 -0400 Subject: [PATCH] Orangefs: Extra sanity insurance on buffer before using string functions on it. Signed-off-by: Mike Marshall --- fs/orangefs/devorangefs-req.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/fs/orangefs/devorangefs-req.c b/fs/orangefs/devorangefs-req.c index 12ea8730aa5d..35418d0b77bf 100644 --- a/fs/orangefs/devorangefs-req.c +++ b/fs/orangefs/devorangefs-req.c @@ -678,6 +678,19 @@ static long dispatch_ioctl_command(unsigned int command, unsigned long arg) ret = copy_from_user(&client_debug_array_string, (void __user *)arg, ORANGEFS_MAX_DEBUG_STRING_LEN); + /* + * The real client-core makes an effort to ensure + * that actual strings that aren't too long to fit in + * this buffer is what we get here. We're going to use + * string functions on the stuff we got, so we'll make + * this extra effort to try and keep from + * flowing out of this buffer when we use the string + * functions, even if somehow the stuff we end up + * with here is garbage. + */ + client_debug_array_string[ORANGEFS_MAX_DEBUG_STRING_LEN - 1] = + '\0'; + if (ret != 0) { pr_info("%s: CLIENT_STRING: copy_from_user failed\n", __func__); -- 2.30.2