Staging: sep: return -EFAULT on copy_to_user errors

copy_to_user() returns the number of bytes remaining but we want to
return a negative error code here.  These functions are used in the
ioctl handler and the error code gets returned to userspace.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 40 insertions, 12 deletions

diff --git a/drivers/staging/sep/sep_driver.c b/drivers/staging/sep/sep_driver.c
index 0332c370fd82..ecbde3467b1b 100644
--- a/drivers/staging/sep/sep_driver.c
+++ b/drivers/staging/sep/sep_driver.c
@@ -594,8 +594,10 @@ static int sep_allocate_data_pool_memory_handler(struct sep_device *sep,
         dbg("SEP Driver:--------> sep_allocate_data_pool_memory_handler start\n");
 
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_alloc_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         /* allocate memory */
         if ((sep->data_pool_bytes_allocated + command_args.num_bytes) > SEP_DRIVER_DATA_POOL_SHARED_AREA_SIZE_IN_BYTES) {
@@ -609,8 +611,10 @@ static int sep_allocate_data_pool_memory_handler(struct sep_device *sep,
 
         /* write the memory back to the user space */
         error = copy_to_user((void *) arg, (void *) &command_args, sizeof(struct sep_driver_alloc_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         /* set the allocation */
         sep->data_pool_bytes_allocated += command_args.num_bytes;
@@ -661,6 +665,8 @@ static int sep_write_into_data_pool_handler(struct sep_device *sep, unsigned lon
         }
         /* copy the application data */
         error = copy_from_user(virt_address, (void *) app_in_address, num_bytes);
+        if (error)
+                error = -EFAULT;
 end_function:
         dbg("SEP Driver:<-------- sep_write_into_data_pool_handler end\n");
         return error;
@@ -711,6 +717,8 @@ static int sep_read_from_data_pool_handler(struct sep_device *sep, unsigned long
 
         /* copy the application data */
         error = copy_to_user((void *) app_out_address, virt_address, num_bytes);
+        if (error)
+                error = -EFAULT;
 end_function:
         dbg("SEP Driver:<-------- sep_read_from_data_pool_handler end\n");
         return error;
@@ -1448,8 +1456,10 @@ static int sep_create_sync_dma_tables_handler(struct sep_device *sep,
         dbg("SEP Driver:--------> sep_create_sync_dma_tables_handler start\n");
 
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_build_sync_table_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         edbg("app_in_address is %08lx\n", command_args.app_in_address);
         edbg("app_out_address is %08lx\n", command_args.app_out_address);
@@ -1799,8 +1809,10 @@ static int sep_create_flow_dma_tables_handler(struct sep_device *sep,
                 goto end_function;
 
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_build_flow_table_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         /* create flow tables */
         error = sep_prepare_flow_dma_tables(sep, command_args.num_virtual_buffers, command_args.virt_buff_data_addr, flow_context_ptr, &first_table_data, &last_table_data, command_args.isKernelVirtualAddress);
@@ -1819,8 +1831,10 @@ static int sep_create_flow_dma_tables_handler(struct sep_device *sep,
 
         /* send the parameters to user application */
         error = copy_to_user((void *) arg, &command_args, sizeof(struct sep_driver_build_flow_table_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function_with_error;
+        }
 
         /* all the flow created  - update the flow entry with temp id */
         flow_context_ptr->flow_id = SEP_TEMP_FLOW_ID;
@@ -1861,8 +1875,10 @@ static int sep_add_flow_tables_handler(struct sep_device *sep, unsigned long arg
 
         /* get input parameters */
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_add_flow_table_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         /* find the flow structure for the flow id */
         flow_context_ptr = sep_find_flow_context(sep, command_args.flow_id);
@@ -1933,6 +1949,8 @@ static int sep_add_flow_tables_handler(struct sep_device *sep, unsigned long arg
 
         /* send the parameters to user application */
         error = copy_to_user((void *) arg, &command_args, sizeof(struct sep_driver_add_flow_table_t));
+        if (error)
+                error = -EFAULT;
 end_function_with_error:
         /* free the allocated tables */
         sep_deallocated_flow_tables(&first_table_data);
@@ -1953,8 +1971,10 @@ static int sep_add_flow_tables_message_handler(struct sep_device *sep, unsigned
         dbg("SEP Driver:--------> sep_add_flow_tables_message_handler start\n");
 
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_add_message_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         /* check input */
         if (command_args.message_size_in_bytes > SEP_MAX_ADD_MESSAGE_LENGTH_IN_BYTES) {
@@ -1970,6 +1990,8 @@ static int sep_add_flow_tables_message_handler(struct sep_device *sep, unsigned
         /* copy the message into context */
         flow_context_ptr->message_size_in_bytes = command_args.message_size_in_bytes;
         error = copy_from_user(flow_context_ptr->message, (void *) command_args.message_address, command_args.message_size_in_bytes);
+        if (error)
+                error = -EFAULT;
 end_function:
         dbg("SEP Driver:<-------- sep_add_flow_tables_message_handler end\n");
         return error;
@@ -1994,6 +2016,8 @@ static int sep_get_static_pool_addr_handler(struct sep_device *sep, unsigned lon
 
         /* send the parameters to user application */
         error = copy_to_user((void *) arg, &command_args, sizeof(struct sep_driver_static_pool_addr_t));
+        if (error)
+                error = -EFAULT;
         dbg("SEP Driver:<-------- sep_get_static_pool_addr_handler end\n");
         return error;
 }
@@ -2010,8 +2034,10 @@ static int sep_get_physical_mapped_offset_handler(struct sep_device *sep, unsign
         dbg("SEP Driver:--------> sep_get_physical_mapped_offset_handler start\n");
 
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_get_mapped_offset_t));
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
 
         if (command_args.physical_address < sep->shared_bus) {
                 error = -EINVAL;
@@ -2025,6 +2051,8 @@ static int sep_get_physical_mapped_offset_handler(struct sep_device *sep, unsign
 
         /* send the parameters to user application */
         error = copy_to_user((void *) arg, &command_args, sizeof(struct sep_driver_get_mapped_offset_t));
+        if (error)
+                error = -EFAULT;
 end_function:
         dbg("SEP Driver:<-------- sep_get_physical_mapped_offset_handler end\n");
         return error;
@@ -2070,11 +2098,11 @@ static int sep_init_handler(struct sep_device *sep, unsigned long arg)
         error = 0;
 
         error = copy_from_user(&command_args, (void *) arg, sizeof(struct sep_driver_init_t));
-
-        dbg("SEP Driver:--------> sep_init_handler - finished copy_from_user \n");
-
-        if (error)
+        if (error) {
+                error = -EFAULT;
                 goto end_function;
+        }
+        dbg("SEP Driver:--------> sep_init_handler - finished copy_from_user\n");
 
         /* PATCH - configure the DMA to single -burst instead of multi-burst */
         /*sep_configure_dma_burst(); */