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saner calling conventions for copy_mount_options()

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let it just return NULL, pointer to kernel copy or ERR_PTR().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-12-14 18:44:44 -05:00
parent cc4e719e83
commit b40ef8696f
3 changed files with 28 additions and 30 deletions
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21
fs/compat.c
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@ -792,7 +792,7 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
const void __user *, data)
{
char *kernel_type;
unsigned long data_page;
void *options;
char *kernel_dev;
int retval;
@ -806,26 +806,25 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
if (IS_ERR(kernel_dev))
goto out1;
retval = copy_mount_options(data, &data_page);
if (retval < 0)
options = copy_mount_options(data);
retval = PTR_ERR(options);
if (IS_ERR(options))
goto out2;
retval = -EINVAL;
if (kernel_type && data_page) {
if (kernel_type && options) {
if (!strcmp(kernel_type, NCPFS_NAME)) {
do_ncp_super_data_conv((void *)data_page);
do_ncp_super_data_conv(options);
} else if (!strcmp(kernel_type, NFS4_NAME)) {
if (do_nfs4_super_data_conv((void *) data_page))
retval = -EINVAL;
if (do_nfs4_super_data_conv(options))
goto out3;
}
}
retval = do_mount(kernel_dev, dir_name, kernel_type,
flags, (void*)data_page);
retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
out3:
free_page(data_page);
kfree(options);
out2:
kfree(kernel_dev);
out1: