From: Ronnie Sahlberg lsahlber@redhat.com
commit 981567bd965329df7e64b13e92a54da816c1e0a4 upstream.
RHBZ: 1972502
PATH_MAX is 4096 but PAGE_SIZE can be >4096 on some architectures such as ppc and would thus write beyond the end of the actual object.
Cc: stable@vger.kernel.org Reported-by: Xiaoli Feng xifeng@redhat.com Suggested-by: Brian foster bfoster@redhat.com Reviewed-by: Paulo Alcantara (SUSE) pc@cjr.nz Signed-off-by: Ronnie Sahlberg lsahlber@redhat.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/cifs/dir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -112,7 +112,7 @@ build_path_from_dentry_optional_prefix(s if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
- s = dentry_path_raw(direntry, page, PAGE_SIZE); + s = dentry_path_raw(direntry, page, PATH_MAX); if (IS_ERR(s)) return s; if (!s[1]) // for root we want "", not "/"