From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Date: Wed, 22 Oct 2014 14:23:07 +0000 Subject: [patch 2/2 v2] staging: lustre: validate size in ll_setxattr() Message-Id: <20141022142306.GA2279@mwanda> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kernel-janitors@vger.kernel.org If size is smaller than the lov_user_md struct then we are reading beyond the end of the buffer. I guess this is an information leak or it could cause an Oops if the memory is not mapped. Signed-off-by: Dan Carpenter --- v2: Andrew Perepechko pointed out that the check needs to be inside the if statement. diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c index 252a619..3ad9796 100644 --- a/drivers/staging/lustre/lustre/llite/xattr.c +++ b/drivers/staging/lustre/lustre/llite/xattr.c @@ -234,6 +234,9 @@ int ll_setxattr(struct dentry *dentry, const char *name, struct lov_user_md *lump = (struct lov_user_md *)value; int rc = 0; + if (size != 0 && size < sizeof(struct lov_user_md)) + return -EINVAL; + /* Attributes that are saved via getxattr will always have * the stripe_offset as 0. Instead, the MDS should be * allowed to pick the starting OST index. b846 */