lkml.org 
[lkml]   [2021]   [Dec]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] MIPS: signal: Return immediately if call fails
Date
When debug sigaltstack(), copy_siginfo_to_user() fails first in
setup_rt_frame() if the alternate signal stack is too small, so
it should return immediately if call fails, no need to call the
following functions.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
arch/mips/kernel/signal.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index c1632e8..4cd3969 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -761,15 +761,28 @@ static int setup_rt_frame(void *sig_return, struct ksignal *ksig,
return -EFAULT;

/* Create siginfo. */
- err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info);
+ err = copy_siginfo_to_user(&frame->rs_info, &ksig->info);
+ if (err)
+ return -EFAULT;

/* Create the ucontext. */
- err |= __put_user(0, &frame->rs_uc.uc_flags);
- err |= __put_user(NULL, &frame->rs_uc.uc_link);
- err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
- err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
- err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+ err = __put_user(0, &frame->rs_uc.uc_flags);
+ if (err)
+ return -EFAULT;
+
+ err = __put_user(NULL, &frame->rs_uc.uc_link);
+ if (err)
+ return -EFAULT;
+
+ err = __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
+ if (err)
+ return -EFAULT;
+
+ err = setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+ if (err)
+ return -EFAULT;

+ err = __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
if (err)
return -EFAULT;

--
2.1.0
\
 
 \ /
  Last update: 2021-12-18 04:24    [W:1.195 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site