* [PATCH -next] tee: fix possible error pointer ctx dereferencing
@ 2019-02-20 6:02 Sumit Garg
2019-02-22 8:09 ` Jens Wiklander
0 siblings, 1 reply; 2+ messages in thread
From: Sumit Garg @ 2019-02-20 6:02 UTC (permalink / raw)
To: jens.wiklander; +Cc: Sumit Garg, linux-arm-kernel, dan.carpenter, linux-kernel
Add check for valid ctx pointer and then only dereference ctx to
configure supp_nowait flag.
Fixes: 42bf4152d8a7 ("tee: add supp_nowait flag in tee_context struct")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---
drivers/tee/tee_core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 25f3b9c..06fbfc0 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -993,7 +993,9 @@ tee_client_open_context(struct tee_context *start,
* tee_client_open_session() if any in kernel client requires
* different behaviour.
*/
- ctx->supp_nowait = true;
+ if (!IS_ERR(ctx))
+ ctx->supp_nowait = true;
+
return ctx;
}
EXPORT_SYMBOL_GPL(tee_client_open_context);
--
2.7.4
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* Re: [PATCH -next] tee: fix possible error pointer ctx dereferencing
2019-02-20 6:02 [PATCH -next] tee: fix possible error pointer ctx dereferencing Sumit Garg
@ 2019-02-22 8:09 ` Jens Wiklander
0 siblings, 0 replies; 2+ messages in thread
From: Jens Wiklander @ 2019-02-22 8:09 UTC (permalink / raw)
To: Sumit Garg
Cc: Arnd Bergmann, Linux ARM, Dan Carpenter, Linux Kernel Mailing List
Hi,
On Wed, Feb 20, 2019 at 7:02 AM Sumit Garg <sumit.garg@linaro.org> wrote:
>
> Add check for valid ctx pointer and then only dereference ctx to
> configure supp_nowait flag.
>
> Fixes: 42bf4152d8a7 ("tee: add supp_nowait flag in tee_context struct")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> ---
> drivers/tee/tee_core.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
I see that Arnd picked this one up the arm/drivers branch too. Thanks
for the help Arnd!
Cheers,
Jens
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