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crypto: cavium - prevent integer overflow loading firmware 

[ Upstream commit 2526d6bf27 ]

The "code_length" value comes from the firmware file.  If your firmware
is untrusted realistically there is probably very little you can do to
protect yourself.  Still we try to limit the damage as much as possible.
Also Smatch marks any data read from the filesystem as untrusted and
prints warnings if it not capped correctly.

The "ntohl(ucode->code_length) * 2" multiplication can have an
integer overflow.

Fixes: 9e2c7d9994 ("crypto: cavium - Add Support for Octeon-tx CPT Engine")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2022-09-19 09:43:27 +03:00 committed by Greg Kroah-Hartman
parent 8f5eee162e
commit 371fa5129a
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/crypto/cavium/cpt/cptpf_main.c
View File

@ -253,6 +253,7 @@ static int cpt_ucode_load_fw(struct cpt_device *cpt, const u8 *fw, bool is_ae)
const struct firmware *fw_entry;
struct device *dev = &cpt->pdev->dev;
struct ucode_header *ucode;
unsigned int code_length;
struct microcode *mcode;
int j, ret = 0;
@ -263,11 +264,12 @@ static int cpt_ucode_load_fw(struct cpt_device *cpt, const u8 *fw, bool is_ae)
ucode = (struct ucode_header *)fw_entry->data;
mcode = &cpt->mcode[cpt->next_mc_idx];
memcpy(mcode->version, (u8 *)fw_entry->data, CPT_UCODE_VERSION_SZ);
mcode->code_size = ntohl(ucode->code_length) * 2;
if (!mcode->code_size) {
code_length = ntohl(ucode->code_length);
if (code_length == 0 || code_length >= INT_MAX / 2) {
ret = -EINVAL;
goto fw_release;
}
mcode->code_size = code_length * 2;
mcode->is_ae = is_ae;
mcode->core_mask = 0ULL;