Commit 778f3dd5 authored by David Miller's avatar David Miller Committed by Linus Torvalds

Fix procfs compat_ioctl regression

It is important to only provide the compat_ioctl method
if the downstream de->proc_fops does too, otherwise this
utterly confuses the logic in fs/compat_ioctl.c and we
end up doing the wrong thing.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Acked-by: default avatarAlexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 040b3a2d
......@@ -386,6 +386,19 @@ static const struct file_operations proc_reg_file_ops = {
.release = proc_reg_release,
};
#ifdef CONFIG_COMPAT
static const struct file_operations proc_reg_file_ops_no_compat = {
.llseek = proc_reg_llseek,
.read = proc_reg_read,
.write = proc_reg_write,
.poll = proc_reg_poll,
.unlocked_ioctl = proc_reg_unlocked_ioctl,
.mmap = proc_reg_mmap,
.open = proc_reg_open,
.release = proc_reg_release,
};
#endif
struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
struct proc_dir_entry *de)
{
......@@ -413,8 +426,15 @@ struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
if (de->proc_iops)
inode->i_op = de->proc_iops;
if (de->proc_fops) {
if (S_ISREG(inode->i_mode))
if (S_ISREG(inode->i_mode)) {
#ifdef CONFIG_COMPAT
if (!de->proc_fops->compat_ioctl)
inode->i_fop =
&proc_reg_file_ops_no_compat;
else
#endif
inode->i_fop = &proc_reg_file_ops;
}
else
inode->i_fop = de->proc_fops;
}
......
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