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Thu, 11 Jun 2026 14:36:35 +0800 From: Hongling Zeng To: vkoul@kernel.org, Frank.Li@kernel.org, wens@kernel.org, jernej.skrabec@gmail.com, samuel@sholland.org, mripard@kernel.org, arnd@arndb.de Cc: dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, zhongling0719@126.com, Hongling Zeng Subject: [PATCH] dmaengine: sun6i-dma: Fix use-after-free in error handling paths Date: Thu, 11 Jun 2026 14:36:31 +0800 Message-Id: <20260611063631.96566-1-zenghongling@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Server: rspamd-worker-8404 X-Spamd-Result: default: False [-0.66 / 15.00]; BAYES_HAM(-5.50)[100.00%]; RBL_SENDERSCORE(2.00)[172.234.253.10:from]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; MAILLIST(-0.15)[generic]; BAD_REP_POLICIES(0.10)[]; MIME_GOOD(-0.10)[text/plain]; 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Fix by saving both the next virtual and physical pointers before freeing the current node. Fixes: 555859308723 ("dmaengine: Add driver for Allwinner sun6i DMA") Signed-off-by: Hongling Zeng --- drivers/dma/sun6i-dma.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index a9a254dbf8cb..eb9c4ae87ac8 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -788,9 +788,15 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( return vchan_tx_prep(&vchan->vc, &txd->vd, flags); err_lli_free: - for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli; - p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next) + p_lli = txd->p_lli; + v_lli = txd->v_lli; + while (v_lli) { + struct sun6i_dma_lli *next_v_lli = v_lli->v_lli_next; + dma_addr_t next_p_lli = v_lli->p_lli_next; dma_pool_free(sdev->pool, v_lli, p_lli); + v_lli = next_v_lli; + p_lli = next_p_lli; + } kfree(txd); return NULL; } @@ -869,9 +875,15 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic( return vchan_tx_prep(&vchan->vc, &txd->vd, flags); err_lli_free: - for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli; - p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next) + p_lli = txd->p_lli; + v_lli = txd->v_lli; + while (v_lli) { + struct sun6i_dma_lli *next_v_lli = v_lli->v_lli_next; + dma_addr_t next_p_lli = v_lli->p_lli_next; dma_pool_free(sdev->pool, v_lli, p_lli); + v_lli = next_v_lli; + p_lli = next_p_lli; + } kfree(txd); return NULL; }