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

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;