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media: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf()
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commit 8d4abca upstream.

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 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: KSPP/linux#109
Fixes: dae52d0 ("V4L/DVB: ngene: Initial check-in")
Cc: stable@vger.kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/linux-hardening/20210420001631.GA45456@embeddedor/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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GustavoARSilva authored and gregkh committed Jul 28, 2021
1 parent f5ef2fe commit b9a178f
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Showing 2 changed files with 9 additions and 7 deletions.
2 changes: 1 addition & 1 deletion drivers/media/pci/ngene/ngene-core.c
Expand Up @@ -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;

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14 changes: 8 additions & 6 deletions drivers/media/pci/ngene/ngene.h
Expand Up @@ -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 {
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