[PATCH] compat: fix uaccess handling

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 20 insertions, 13 deletions

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index a91f2628c981..6e3177685556 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -211,8 +211,10 @@ static int do_video_stillpicture(unsigned int fd, unsigned int cmd, unsigned lon
         up_native =
                 compat_alloc_user_space(sizeof(struct video_still_picture));
 
-        put_user(compat_ptr(fp), &up_native->iFrame);
-        put_user(size, &up_native->size);
+        err =  put_user(compat_ptr(fp), &up_native->iFrame);
+        err |= put_user(size, &up_native->size);
+        if (err)
+                return -EFAULT;
 
         err = sys_ioctl(fd, cmd, (unsigned long) up_native);
 
@@ -236,8 +238,10 @@ static int do_video_set_spu_palette(unsigned int fd, unsigned int cmd, unsigned
         err |= get_user(length, &up->length);
 
         up_native = compat_alloc_user_space(sizeof(struct video_spu_palette));
-        put_user(compat_ptr(palp), &up_native->palette);
-        put_user(length, &up_native->length);
+        err  = put_user(compat_ptr(palp), &up_native->palette);
+        err |= put_user(length, &up_native->length);
+        if (err)
+                return -EFAULT;
 
         err = sys_ioctl(fd, cmd, (unsigned long) up_native);
 
@@ -2043,16 +2047,19 @@ static int serial_struct_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
         struct serial_struct ss;
         mm_segment_t oldseg = get_fs();
         __u32 udata;
+        unsigned int base;
 
         if (cmd == TIOCSSERIAL) {
                 if (!access_ok(VERIFY_READ, ss32, sizeof(SS32)))
                         return -EFAULT;
                 if (__copy_from_user(&ss, ss32, offsetof(SS32, iomem_base)))
                         return -EFAULT;
-                __get_user(udata, &ss32->iomem_base);
+                if (__get_user(udata, &ss32->iomem_base))
+                        return -EFAULT;
                 ss.iomem_base = compat_ptr(udata);
-                __get_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift);
-                __get_user(ss.port_high, &ss32->port_high);
+                if (__get_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift) ||
+                    __get_user(ss.port_high, &ss32->port_high))
+                        return -EFAULT;
                 ss.iomap_base = 0UL;
         }
         set_fs(KERNEL_DS);
@@ -2063,12 +2070,12 @@ static int serial_struct_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
                         return -EFAULT;
                 if (__copy_to_user(ss32,&ss,offsetof(SS32,iomem_base)))
                         return -EFAULT;
-                __put_user((unsigned long)ss.iomem_base  >> 32 ?
-                            0xffffffff : (unsigned)(unsigned long)ss.iomem_base,
-                            &ss32->iomem_base);
-                __put_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift);
-                __put_user(ss.port_high, &ss32->port_high);
-
+                base = (unsigned long)ss.iomem_base  >> 32 ?
+                        0xffffffff : (unsigned)(unsigned long)ss.iomem_base;
+                if (__put_user(base, &ss32->iomem_base) ||
+                    __put_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift) ||
+                    __put_user(ss.port_high, &ss32->port_high))
+                        return -EFAULT;
         }
         return err;
 }