mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
e74ead2249
The patches were generated from the RPi repo with the following command: git format-patch v6.6.36..rpi-6.6.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
From 5b3c219b5e5bc4ecd4e0dde7688929ff14cd08b0 Mon Sep 17 00:00:00 2001
|
|
From: popcornmix <popcornmix@gmail.com>
|
|
Date: Tue, 23 Apr 2024 09:51:36 +0100
|
|
Subject: [PATCH 1047/1085] dw-axi-dmac-platform: Avoid trampling with zero
|
|
length buffer
|
|
|
|
This code:
|
|
for_each_sg(sgl, sg, sg_len, i)
|
|
num_sgs += DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
|
|
|
|
determines how many hw_desc are allocated.
|
|
If sg_dma_len(sg)=0 we don't allocate for this sgl.
|
|
|
|
However in the next loop, we will increment loop
|
|
for this case, and loop gets higher than num_sgs
|
|
and we trample memory.
|
|
|
|
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
|
|
---
|
|
drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 3 +++
|
|
1 file changed, 3 insertions(+)
|
|
|
|
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
|
|
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
|
|
@@ -834,6 +834,9 @@ dw_axi_dma_chan_prep_slave_sg(struct dma
|
|
mem = sg_dma_address(sg);
|
|
len = sg_dma_len(sg);
|
|
num_segments = DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
|
|
+ if (!num_segments)
|
|
+ continue;
|
|
+
|
|
segment_len = DIV_ROUND_UP(sg_dma_len(sg), num_segments);
|
|
|
|
do {
|