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media: staging/intel-ipu3: css: Fix wrong size comparison imgu_css_fw_init

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commit a44f9d6f9dc1fb314a3f1ed2dcd4fbbcc3d9f892 upstream.

There is a wrong comparison of the total size of the loaded firmware
css->fw->size with the size of a pointer to struct imgu_fw_header.

Turn binary_header into a flexible-array member[1][2], use the
struct_size() helper and fix the wrong size comparison. Notice
that the loaded firmware needs to contain at least one 'struct
imgu_fw_info' item in the binary_header[] array.

It's also worth mentioning that

	"css->fw->size < struct_size(css->fwp, binary_header, 1)"

with binary_header declared as a flexible-array member is equivalent
to

	"css->fw->size < sizeof(struct imgu_fw_header)"

with binary_header declared as a one-element array (as in the original
code).

The replacement of the one-element array with a flexible-array member
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().

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109

Fixes: 09d290f0ba ("media: staging/intel-ipu3: css: Add support for firmware management")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2021-08-10 19:09:55 +02:00 committed by Greg Kroah-Hartman
parent 1cf43e9289
commit 8971158af1
2 changed files with 4 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/staging/media/ipu3/ipu3-css-fw.c
View File

@ -124,12 +124,11 @@ int imgu_css_fw_init(struct imgu_css *css)
/* Check and display fw header info */
css->fwp = (struct imgu_fw_header *)css->fw->data;
if (css->fw->size < sizeof(struct imgu_fw_header *) ||
if (css->fw->size < struct_size(css->fwp, binary_header, 1) ||
css->fwp->file_header.h_size != sizeof(struct imgu_fw_bi_file_h))
goto bad_fw;
if (sizeof(struct imgu_fw_bi_file_h) +
css->fwp->file_header.binary_nr * sizeof(struct imgu_fw_info) >
css->fw->size)
if (struct_size(css->fwp, binary_header,
css->fwp->file_header.binary_nr) > css->fw->size)
goto bad_fw;
dev_info(dev, "loaded firmware version %.64s, %u binaries, %zu bytes\n",

2
drivers/staging/media/ipu3/ipu3-css-fw.h
View File

@ -170,7 +170,7 @@ struct imgu_fw_bi_file_h {
struct imgu_fw_header {
struct imgu_fw_bi_file_h file_header;
struct imgu_fw_info binary_header[1]; /* binary_nr items */
struct imgu_fw_info binary_header[]; /* binary_nr items */
};
/******************* Firmware functions *******************/