Fix an 11-year old bug in ngene_command_config_free_buf() while
addressing the following warnings caught with -Warray-bounds:

arch/alpha/include/asm/string.h:22:16: warning: '__builtin_memcpy' offset [12, 
16] from the object at 'com' is out of the bounds of referenced subobject 
'config' with type 'unsigned char' at offset 10 [-Warray-bounds]
arch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset 
[12, 16] from the object at 'com' is out of the bounds of referenced subobject 
'config' with type 'unsigned char' at offset 10 [-Warray-bounds]

The problem is that the original code is trying to copy 6 bytes of
data into a one-byte size member _config_ of the wrong structue
FW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a
legitimate compiler warning because memcpy() overruns the length
of &com.cmd.ConfigureBuffers.config. It seems that the right
structure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains
6 more members apart from the header _hdr_. Also, the name of
the function ngene_command_config_free_buf() suggests that the actual
intention is to ConfigureFreeBuffers, instead of ConfigureBuffers
(which configuration takes place in the function ngene_command_config_buf(),
above).

Fix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS
into new struct config, and use &com.cmd.ConfigureFreeBuffers.config as
the destination address, instead of &com.cmd.ConfigureBuffers.config,
when calling memcpy().

This also helps with the ongoing efforts to globally enable
-Warray-bounds and get us closer to being able to tighten the
FORTIFY_SOURCE routines on memcpy().

Link: https://github.com/KSPP/linux/issues/109
Fixes: dae52d009fc9 ("V4L/DVB: ngene: Initial check-in")
Cc: sta...@vger.kernel.org
Reported-by: kernel test robot <l...@intel.com>
Signed-off-by: Gustavo A. R. Silva <gustavo...@kernel.org>
---
 drivers/media/pci/ngene/ngene-core.c |  2 +-
 drivers/media/pci/ngene/ngene.h      | 14 ++++++++------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/media/pci/ngene/ngene-core.c 
b/drivers/media/pci/ngene/ngene-core.c
index 07f342db6701..7481f553f959 100644
--- a/drivers/media/pci/ngene/ngene-core.c
+++ b/drivers/media/pci/ngene/ngene-core.c
@@ -385,7 +385,7 @@ static int ngene_command_config_free_buf(struct ngene *dev, 
u8 *config)
 
        com.cmd.hdr.Opcode = CMD_CONFIGURE_FREE_BUFFER;
        com.cmd.hdr.Length = 6;
-       memcpy(&com.cmd.ConfigureBuffers.config, config, 6);
+       memcpy(&com.cmd.ConfigureFreeBuffers.config, config, 6);
        com.in_len = 6;
        com.out_len = 0;
 
diff --git a/drivers/media/pci/ngene/ngene.h b/drivers/media/pci/ngene/ngene.h
index 84f04e0e0cb9..3d296f1998a1 100644
--- a/drivers/media/pci/ngene/ngene.h
+++ b/drivers/media/pci/ngene/ngene.h
@@ -407,12 +407,14 @@ enum _BUFFER_CONFIGS {
 
 struct FW_CONFIGURE_FREE_BUFFERS {
        struct FW_HEADER hdr;
-       u8   UVI1_BufferLength;
-       u8   UVI2_BufferLength;
-       u8   TVO_BufferLength;
-       u8   AUD1_BufferLength;
-       u8   AUD2_BufferLength;
-       u8   TVA_BufferLength;
+       struct {
+               u8   UVI1_BufferLength;
+               u8   UVI2_BufferLength;
+               u8   TVO_BufferLength;
+               u8   AUD1_BufferLength;
+               u8   AUD2_BufferLength;
+               u8   TVA_BufferLength;
+       } __packed config;
 } __attribute__ ((__packed__));
 
 struct FW_CONFIGURE_UART {
-- 
2.27.0

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