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arc: kernel: Return -EFAULT if copy_to_user() fails

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[ Upstream commit 46e152186c ]

The copy_to_user() function returns the number of bytes remaining to be
copied, but we want to return -EFAULT if the copy doesn't complete.

Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wang Qing 2021-03-01 20:05:48 +08:00 committed by Greg Kroah-Hartman
parent f12e8cf6b1
commit b448a6a2fc
1 changed files with 2 additions and 2 deletions
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4
arch/arc/kernel/signal.c
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@ -96,7 +96,7 @@ stash_usr_regs(struct rt_sigframe __user *sf, struct pt_regs *regs,
sizeof(sf->uc.uc_mcontext.regs.scratch)); sizeof(sf->uc.uc_mcontext.regs.scratch));
err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t)); err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t));
return err; return err ? -EFAULT : 0;
} }
static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf) static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
@ -110,7 +110,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
&(sf->uc.uc_mcontext.regs.scratch), &(sf->uc.uc_mcontext.regs.scratch),
sizeof(sf->uc.uc_mcontext.regs.scratch)); sizeof(sf->uc.uc_mcontext.regs.scratch));
if (err) if (err)
return err; return -EFAULT;
set_current_blocked(&set); set_current_blocked(&set);
regs->bta = uregs.scratch.bta; regs->bta = uregs.scratch.bta;