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[Qemu-devel] [PATCH 1/3] linux-user: Allow NULL value pointer in setxatt
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH 1/3] linux-user: Allow NULL value pointer in setxattr and getxattr |
Date: |
Wed, 14 Dec 2011 15:37:17 +0000 |
It's valid to pass a NULL value pointer to setxattr, so don't
fail this case EFAULT.
Signed-off-by: Peter Maydell <address@hidden>
---
linux-user/syscall.c | 24 ++++++++++++++++++------
1 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f227097..ca4503d 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7655,11 +7655,17 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
break;
case TARGET_NR_setxattr:
{
- void *p, *n, *v;
+ void *p, *n, *v = 0;
+ if (arg3) {
+ v = lock_user(VERIFY_READ, arg3, arg4, 1);
+ if (!v) {
+ ret = -TARGET_EFAULT;
+ break;
+ }
+ }
p = lock_user_string(arg1);
n = lock_user_string(arg2);
- v = lock_user(VERIFY_READ, arg3, arg4, 1);
- if (p && n && v) {
+ if (p && n) {
ret = get_errno(setxattr(p, n, v, arg4, arg5));
} else {
ret = -TARGET_EFAULT;
@@ -7671,11 +7677,17 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
break;
case TARGET_NR_getxattr:
{
- void *p, *n, *v;
+ void *p, *n, *v = 0;
+ if (arg3) {
+ v = lock_user(VERIFY_WRITE, arg3, arg4, 0);
+ if (!v) {
+ ret = -TARGET_EFAULT;
+ break;
+ }
+ }
p = lock_user_string(arg1);
n = lock_user_string(arg2);
- v = lock_user(VERIFY_WRITE, arg3, arg4, 0);
- if (p && n && v) {
+ if (p && n) {
ret = get_errno(getxattr(p, n, v, arg4));
} else {
ret = -TARGET_EFAULT;
--
1.7.5.4