From: Dan Carpenter Date: Mon, 22 May 2017 12:08:31 +0000 (+0300) Subject: orangefs: off by ones in xattr size checks X-Git-Tag: v4.14-rc1~14^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5f13e58767a53ebb54265e03c0c4a67650286263;p=platform%2Fkernel%2Flinux-rpi.git orangefs: off by ones in xattr size checks A previous patch which claimed to remove off by ones actually introduced them. strlen() returns the length of the string not including the NUL character. We are using strcpy() to copy "name" into a buffer which is ORANGEFS_MAX_XATTR_NAMELEN characters long. We should make sure to leave space for the NUL, otherwise we're writing one character beyond the end of the buffer. Fixes: e675c5ec51fe ("orangefs: clean up oversize xattr validation") Signed-off-by: Dan Carpenter Signed-off-by: Mike Marshall --- diff --git a/fs/orangefs/xattr.c b/fs/orangefs/xattr.c index 237c9c0..a34b25b 100644 --- a/fs/orangefs/xattr.c +++ b/fs/orangefs/xattr.c @@ -76,7 +76,7 @@ ssize_t orangefs_inode_getxattr(struct inode *inode, const char *name, if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; - if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN) + if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) return -EINVAL; fsuid = from_kuid(&init_user_ns, current_fsuid()); @@ -169,7 +169,7 @@ static int orangefs_inode_removexattr(struct inode *inode, const char *name, struct orangefs_kernel_op_s *new_op = NULL; int ret = -ENOMEM; - if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN) + if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) return -EINVAL; down_write(&orangefs_inode->xattr_sem); @@ -233,7 +233,7 @@ int orangefs_inode_setxattr(struct inode *inode, const char *name, if (size > ORANGEFS_MAX_XATTR_VALUELEN) return -EINVAL; - if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN) + if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) return -EINVAL; internal_flag = convert_to_internal_xattr_flags(flags);