sh: missing checks of __get_user()/__put_user() return values

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 27 insertions, 22 deletions

diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 04d776f..cb4172c 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -71,10 +71,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
 		old_sigset_t mask;
 		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+		    __get_user(mask, &act->sa_mask))
 			return -EFAULT;
-		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		__get_user(mask, &act->sa_mask);
 		siginitset(&new_ka.sa.sa_mask, mask);
 	}
 
@@ -83,10 +83,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
 	if (!ret && oact) {
 		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 			return -EFAULT;
-		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 	}
 
 	return ret;
@@ -150,12 +150,11 @@ static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
 	if (!(boot_cpu_data.flags & CPU_HAS_FPU))
 		return 0;
 
-	if (!used_math()) {
-		__put_user(0, &sc->sc_ownedfp);
-		return 0;
-	}
+	if (!used_math())
+		return __put_user(0, &sc->sc_ownedfp);
 
-	__put_user(1, &sc->sc_ownedfp);
+	if (__put_user(1, &sc->sc_ownedfp))
+		return -EFAULT;
 
 	/* This will cause a "finit" to be triggered by the next
 	   attempted FPU operation by the 'current' process.
@@ -195,7 +194,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p
 		regs->sr |= SR_FD; /* Release FPU */
 		clear_fpu(tsk, regs);
 		clear_used_math();
-		__get_user (owned_fp, &sc->sc_ownedfp);
+		err |= __get_user (owned_fp, &sc->sc_ownedfp);
 		if (owned_fp)
 			err |= restore_sigcontext_fpu(sc);
 	}
@@ -386,11 +385,14 @@ static int setup_frame(int sig, struct k_sigaction *ka,
 		struct fdpic_func_descriptor __user *funcptr =
 			(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
 
-		__get_user(regs->pc, &funcptr->text);
-		__get_user(regs->regs[12], &funcptr->GOT);
+		err |= __get_user(regs->pc, &funcptr->text);
+		err |= __get_user(regs->regs[12], &funcptr->GOT);
 	} else
 		regs->pc = (unsigned long)ka->sa.sa_handler;
 
+	if (err)
+		goto give_sigsegv;
+
 	set_fs(USER_DS);
 
 	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
@@ -470,11 +472,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		struct fdpic_func_descriptor __user *funcptr =
 			(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
 
-		__get_user(regs->pc, &funcptr->text);
-		__get_user(regs->regs[12], &funcptr->GOT);
+		err |= __get_user(regs->pc, &funcptr->text);
+		err |= __get_user(regs->regs[12], &funcptr->GOT);
 	} else
 		regs->pc = (unsigned long)ka->sa.sa_handler;
 
+	if (err)
+		goto give_sigsegv;
+
 	set_fs(USER_DS);
 
 	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index 8f6ed23..b589a35 100644
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -173,10 +173,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
 		old_sigset_t mask;
 		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+		    __get_user(mask, &act->sa_mask))
 			return -EFAULT;
-		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		__get_user(mask, &act->sa_mask);
 		siginitset(&new_ka.sa.sa_mask, mask);
 	}
 
@@ -185,10 +185,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
 	if (!ret && oact) {
 		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 			return -EFAULT;
-		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 	}
 
 	return ret;