The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x 1c8093591d1e372d700fe65423e7315a8ecf721b # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023102939-grit-elitism-fb36@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1c8093591d1e372d700fe65423e7315a8ecf721b Mon Sep 17 00:00:00 2001 From: Ekansh Gupta quic_ekangupt@quicinc.com Date: Fri, 13 Oct 2023 13:20:06 +0100 Subject: [PATCH] misc: fastrpc: Clean buffers on remote invocation failures

With current design, buffers and dma handles are not freed in case of remote invocation failures returned from DSP. This could result in buffer leakings and dma handle pointing to wrong memory in the fastrpc kernel. Adding changes to clean buffers and dma handles even when remote invocation to DSP returns failures.

Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Cc: stable stable@kernel.org Signed-off-by: Ekansh Gupta quic_ekangupt@quicinc.com Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Link: https://lore.kernel.org/r/20231013122007.174464-4-srinivas.kandagatla@linaro... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index a52701c1b018..3cdc58488db1 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -1176,11 +1176,6 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, err = wait_for_completion_interruptible(&ctx->work); }

- if (err) - goto bail; - - /* Check the response from remote dsp */ - err = ctx->retval; if (err) goto bail;

@@ -1191,6 +1186,11 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, if (err) goto bail;

+ /* Check the response from remote dsp */ + err = ctx->retval; + if (err) + goto bail; + bail: if (err != -ERESTARTSYS && err != -ETIMEDOUT) { /* We are done with this compute context */