| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 054/239] tee: fix put order in teedev_close_context() | Date | Mon, 24 Jan 2022 19:41:32 +0100 |
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From: Jens Wiklander <jens.wiklander@linaro.org>
[ Upstream commit f18397ab3ae23e8e43bba9986e66af6d4497f2ad ]
Prior to this patch was teedev_close_context() calling tee_device_put() before teedev_ctx_put() leading to teedev_ctx_release() accessing ctx->teedev just after the reference counter was decreased on the teedev. Fix this by calling teedev_ctx_put() before tee_device_put().
Fixes: 217e0250cccb ("tee: use reference counting for tee_context") Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.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 dd46b758852aa..d42fc2ae8592e 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -96,8 +96,10 @@ void teedev_ctx_put(struct tee_context *ctx) static void teedev_close_context(struct tee_context *ctx) { - tee_device_put(ctx->teedev); + struct tee_device *teedev = ctx->teedev; + teedev_ctx_put(ctx); + tee_device_put(teedev); } static int tee_release(struct inode *inode, struct file *filp) -- 2.34.1
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