diff options
| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2021-08-10 20:09:55 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-09-30 11:07:44 +0300 |
| commit | a44f9d6f9dc1fb314a3f1ed2dcd4fbbcc3d9f892 (patch) | |
| tree | 0aec01ed7d4dcbc3f136c8d67892cb248b908faa | |
| parent | 75821f810793efe6034b6798967772f360e4e49f (diff) | |
| download | linux-a44f9d6f9dc1fb314a3f1ed2dcd4fbbcc3d9f892.tar.xz | |
media: staging/intel-ipu3: css: Fix wrong size comparison imgu_css_fw_init
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: 09d290f0ba21 ("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>
| -rw-r--r-- | drivers/staging/media/ipu3/ipu3-css-fw.c | 7 | ||||
| -rw-r--r-- | drivers/staging/media/ipu3/ipu3-css-fw.h | 2 |
2 files changed, 4 insertions, 5 deletions
diff --git a/drivers/staging/media/ipu3/ipu3-css-fw.c b/drivers/staging/media/ipu3/ipu3-css-fw.c index 45aff76198e2..981693eed815 100644 --- a/drivers/staging/media/ipu3/ipu3-css-fw.c +++ b/drivers/staging/media/ipu3/ipu3-css-fw.c @@ -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", diff --git a/drivers/staging/media/ipu3/ipu3-css-fw.h b/drivers/staging/media/ipu3/ipu3-css-fw.h index 3c078f15a295..c0bc57fd678a 100644 --- a/drivers/staging/media/ipu3/ipu3-css-fw.h +++ b/drivers/staging/media/ipu3/ipu3-css-fw.h @@ -171,7 +171,7 @@ 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 *******************/ |