From: Dan Carpenter dan.carpenter@oracle.com
commit 6ed6356b07714e0198be3bc3ecccc8b40a212de4 upstream.
The "bufsize" comes from the root user. If "bufsize" is negative then, because of type promotion, neither of the validation checks at the start of the function are able to catch it:
if (bufsize < sizeof(struct xfs_attrlist) || bufsize > XFS_XATTR_LIST_MAX) return -EINVAL;
This means "bufsize" will trigger (WARN_ON_ONCE(size > INT_MAX)) in kvmalloc_node(). Fix this by changing the type from int to size_t.
Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Reviewed-by: Darrick J. Wong djwong@kernel.org Signed-off-by: Darrick J. Wong djwong@kernel.org Signed-off-by: Amir Goldstein amir73il@gmail.com Acked-by: Darrick J. Wong djwong@kernel.org --- fs/xfs/xfs_ioctl.c | 2 +- fs/xfs/xfs_ioctl.h | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 646735aad45d..d973350d5946 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -371,7 +371,7 @@ int xfs_ioc_attr_list( struct xfs_inode *dp, void __user *ubuf, - int bufsize, + size_t bufsize, int flags, struct xfs_attrlist_cursor __user *ucursor) { diff --git a/fs/xfs/xfs_ioctl.h b/fs/xfs/xfs_ioctl.h index bab6a5a92407..416e20de66e7 100644 --- a/fs/xfs/xfs_ioctl.h +++ b/fs/xfs/xfs_ioctl.h @@ -38,8 +38,9 @@ xfs_readlink_by_handle( int xfs_ioc_attrmulti_one(struct file *parfilp, struct inode *inode, uint32_t opcode, void __user *uname, void __user *value, uint32_t *len, uint32_t flags); -int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf, int bufsize, - int flags, struct xfs_attrlist_cursor __user *ucursor); +int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf, + size_t bufsize, int flags, + struct xfs_attrlist_cursor __user *ucursor);
extern struct dentry * xfs_handle_to_dentry(