4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tom Lendacky <thomas.lenda...@amd.com>
commit afb31cd2d1a1bc3ca055fb2519ec4e9ab969ffe0 upstream.
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: <sta...@vger.kernel.org> # 4.16.x-
Fixes: 2a6170dfe755 ("crypto: ccp: Add Platform Security Processor (PSP) device
support")
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
Acked-by: Gary R Hook <gary.h...@amd.com>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/crypto/ccp/psp-dev.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -856,6 +856,9 @@ void psp_dev_destroy(struct sp_device *s
{
struct psp_device *psp = sp->psp_data;
+ if (!psp)
+ return;
+
if (psp->sev_misc)
kref_put(&misc_dev->refcount, sev_exit);
