ARM: 7851/1: check for number of arguments in syscall_get/set_arguments()

[cascardo/linux.git] / arch / arm / include / asm / syscall.h

diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
index f1d96d4..73ddd72 100644 (file)
--- a/arch/arm/include/asm/syscall.h
+++ b/arch/arm/include/asm/syscall.h
@@ -57,6 +57,9 @@ static inline void syscall_get_arguments(struct task_struct *task,
                                         unsigned int i, unsigned int n,
                                         unsigned long *args)
 {
+       if (n == 0)
+               return;
+
        if (i + n > SYSCALL_MAX_ARGS) {
                unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
                unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
@@ -81,6 +84,9 @@ static inline void syscall_set_arguments(struct task_struct *task,
                                         unsigned int i, unsigned int n,
                                         const unsigned long *args)
 {
+       if (n == 0)
+               return;
+
        if (i + n > SYSCALL_MAX_ARGS) {
                pr_warning("%s called with max args %d, handling only %d\n",
                           __func__, i + n, SYSCALL_MAX_ARGS);