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[v1,3/3] misc: fastrpc: Clean buffers on remote invocation failures

Message ID 1695973360-14369-4-git-send-email-quic_ekangupt@quicinc.com
State New
Headers show
Series [v1,1/3] misc: fastrpc: Reset metadata buffer to avoid incorrect free | expand

Commit Message

Ekansh Gupta Sept. 29, 2023, 7:42 a.m. UTC 
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>
---
 drivers/misc/fastrpc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
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Patch

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index a52701c..3cdc584 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1179,11 +1179,6 @@  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;
-
 	/* make sure that all memory writes by DSP are seen by CPU */
 	dma_rmb();
 	/* populate all the output buffers with results */
@@ -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 */