[Qemu-trivial] [PATCH] linux-user: Add missing check for return value of lock_user

[Stefan Weil]

This fixes a warning from Coverity:
"Dereference null return value (NULL_RETURNS)"

Signed-off-by: Stefan Weil <address@hidden>
---
 linux-user/flatload.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/linux-user/flatload.c b/linux-user/flatload.c
index 566a7a8..56ac790 100644
--- a/linux-user/flatload.c
+++ b/linux-user/flatload.c
@@ -97,11 +97,13 @@ static int target_pread(int fd, abi_ulong ptr, abi_ulong 
len,
                         abi_ulong offset)
 {
     void *buf;
-    int ret;
+    int ret = -TARGET_EFAULT;
 
     buf = lock_user(VERIFY_WRITE, ptr, len, 0);
-    ret = pread(fd, buf, len, offset);
-    unlock_user(buf, ptr, len);
+    if (buf) {
+        ret = pread(fd, buf, len, offset);
+        unlock_user(buf, ptr, len);
+    }
     return ret;
 }
 /****************************************************************************/
-- 
1.7.10.4