From: "Gustavo A. R. Silva" gustavoars@kernel.org
stable inclusion from stable-5.10.79 commit 8971158af1e0138bf0576c16f9aa153f151fb6b4 bugzilla: 185793 https://gitee.com/openeuler/kernel/issues/I4K65C
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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-an...
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Bin Li huawei.libin@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/staging/media/ipu3/ipu3-css-fw.c | 7 +++---- 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 79ffa7045139..650fd25fc79e 100644 --- a/drivers/staging/media/ipu3/ipu3-css-fw.h +++ b/drivers/staging/media/ipu3/ipu3-css-fw.h @@ -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 *******************/