From: Dan Carpenter Date: Tue, 13 Jul 2010 11:34:59 +0000 (+0200) Subject: nfs: include space for the NUL in root path X-Git-Tag: firefly_0821_release~9833^2~1331^2~2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=674b2222920012244ca59978b356b25412a8dcc7;p=firefly-linux-kernel-4.4.55.git nfs: include space for the NUL in root path In root_nfs_name() it does the following: if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) { printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n"); return -1; } sprintf(nfs_export_path, buf, cp); In the original code if (strlen(buf) + strlen(cp) == NFS_MAXPATHLEN) then the sprintf() would lead to an overflow. Generally the rest of the code assumes that the path can have NFS_MAXPATHLEN (1024) characters and a NUL terminator so the fix is to add space to the nfs_export_path[] buffer. Signed-off-by: Dan Carpenter Signed-off-by: Trond Myklebust --- diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c index 6bd19d843af7..df101d9f546a 100644 --- a/fs/nfs/nfsroot.c +++ b/fs/nfs/nfsroot.c @@ -105,7 +105,7 @@ static char nfs_root_name[256] __initdata = ""; static __be32 servaddr __initdata = 0; /* Name of directory to mount */ -static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, }; +static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = { 0, }; /* NFS-related data */ static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */