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crypto: ccp - Validate that platform access mailbox registers are declared

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Some platforms might support platform access doorbell but not mailbox.
Add an extra guard to ensure this doesn't cause accesses to wrong ranges
if a consumer calls psp_send_platform_access_msg().

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2023-05-18 22:24:12 -05:00 • committed by Herbert Xu
parent 66dd59b7aa
commit dd536cb9f7
1 changed files with 5 additions and 0 deletions
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5
drivers/crypto/ccp/platform-access.c
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@ -67,6 +67,11 @@ int psp_send_platform_access_msg(enum psp_platform_access_msg msg,
return -ENODEV;
pa_dev = psp->platform_access_data;
if (!pa_dev->vdata->cmdresp_reg || !pa_dev->vdata->cmdbuff_addr_lo_reg ||
!pa_dev->vdata->cmdbuff_addr_hi_reg)
return -ENODEV;
cmd = psp->io_regs + pa_dev->vdata->cmdresp_reg;
lo = psp->io_regs + pa_dev->vdata->cmdbuff_addr_lo_reg;
hi = psp->io_regs + pa_dev->vdata->cmdbuff_addr_hi_reg;