linux-kernel - [PATCH] misc: fastrpc: fix improper packet size calculation

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Message-Id: <1632125731-18768-1-git-send-email-jeyr@codeaurora.org>
Date:   Mon, 20 Sep 2021 13:45:31 +0530
From:   Jeya R <jeyr@...eaurora.org>
To:     linux-arm-msm@...r.kernel.org, srinivas.kandagatla@...aro.org
Cc:     Jeya R <jeyr@...eaurora.org>, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, fastrpc.upstream@....qualcomm.com
Subject: [PATCH] misc: fastrpc: fix improper packet size calculation

The buffer list is sorted and this is not being
considered while calculating packet size. This
would lead to improper copy length calculation
for non-dmaheap buffers which would eventually
cause sending improper buffers to DSP.

Signed-off-by: Jeya R <jeyr@...eaurora.org>
---
 drivers/misc/fastrpc.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index beda610..a7e550f 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -719,16 +719,21 @@ static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
 {
 	u64 size = 0;
-	int i;
+	int oix = 0;
 
 	size = ALIGN(metalen, FASTRPC_ALIGN);
-	for (i = 0; i < ctx->nscalars; i++) {
+	for (oix = 0; oix < ctx->nbufs; oix++) {
+		int i = ctx->olaps[oix].raix;
+
+		if (ctx->args[i].length == 0)
+			continue;
+
 		if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
 
-			if (ctx->olaps[i].offset == 0)
+			if (ctx->olaps[oix].offset == 0)
 				size = ALIGN(size, FASTRPC_ALIGN);
 
-			size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
+			size += (ctx->olaps[oix].mend - ctx->olaps[oix].mstart);
 		}
 	}
 
-- 
2.7.4