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crypto: ccp - Check for NULL PSP pointer at module unload

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Should the PSP initialization fail, the PSP data structure will be
freed and the value contained in the sp_device struct set to NULL.
At module unload, psp_dev_destroy() does not check if the pointer
value is NULL and will end up dereferencing a NULL pointer.

Add a pointer check of the psp_data field in the sp_device struct
in psp_dev_destroy() and return immediately if it is NULL.

Cc: <stable@vger.kernel.org> # 4.16.x-
Fixes: 2a6170dfe7 ("crypto: ccp: Add Platform Security Processor (PSP) device support")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tom Lendacky 2018-07-26 09:37:59 -05:00 committed by Herbert Xu
parent 4e34e51f48
commit afb31cd2d1
1 changed files with 3 additions and 0 deletions
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3
drivers/crypto/ccp/psp-dev.c
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@ -858,6 +858,9 @@ void psp_dev_destroy(struct sp_device *sp)
{ {
struct psp_device *psp = sp->psp_data; struct psp_device *psp = sp->psp_data;
if (!psp)
return;
if (psp->sev_misc) if (psp->sev_misc)
kref_put(&misc_dev->refcount, sev_exit); kref_put(&misc_dev->refcount, sev_exit);