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Wed, 19 Aug 2026 20:16:55 -0700 (PDT) Received: from ryzen.lan ([2601:644:8000:7a86::e35]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d62d5ae494sm1332405ad.34.2026.08.19.20.16.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Aug 2026 20:16:55 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Vinod Koul , Frank Li , Harninder Rai , Xuelin Shi , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] dmaengine: fsl_raid: zero CF descriptor pool allocations Date: Wed, 19 Aug 2026 20:16:54 -0700 Message-ID: <20260820031654.28450-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The compound frame descriptors and embedded CDBs are allocated from the cf_desc_pool with dma_pool_alloc(), which does not zero the memory. Only cdb32, the gfm coefficients and the frame address/length fields are programmed; the dpi_dest_spec/dpi_src_spec fields in the CDBs and the rbro32 field of each frame are left uninitialized. The hardware reads the whole block (frame 0 length is sizeof(struct fsl_re_xor_cdb) or sizeof(struct fsl_re_pq_cdb)), so uninitialized heap contents are exposed to the device on each new descriptor. Use dma_pool_zalloc() in both fsl_re_chan_alloc_desc() and fsl_re_alloc_chan_resources() so the descriptor and CDB memory is zeroed before it is handed to the RAID engine. Fixes: ad80da658bbc ("dmaengine: Driver support for FSL RaidEngine device.") Assisted-by: opencode:deepseek-v4-flash-free Signed-off-by: Rosen Penev --- drivers/dma/fsl_raid.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/dma/fsl_raid.c b/drivers/dma/fsl_raid.c index 2d86f61105e5..1c316d85cfec 100644 --- a/drivers/dma/fsl_raid.c +++ b/drivers/dma/fsl_raid.c @@ -295,8 +295,8 @@ static struct fsl_re_desc *fsl_re_chan_alloc_desc(struct fsl_re_chan *re_chan, if (!desc) return NULL; - cf = dma_pool_alloc(re_chan->re_dev->cf_desc_pool, GFP_NOWAIT, - &paddr); + cf = dma_pool_zalloc(re_chan->re_dev->cf_desc_pool, GFP_NOWAIT, + &paddr); if (!cf) { kfree(desc); return NULL; @@ -584,8 +584,8 @@ static int fsl_re_alloc_chan_resources(struct dma_chan *chan) if (!desc) break; - cf = dma_pool_alloc(re_chan->re_dev->cf_desc_pool, GFP_KERNEL, - &paddr); + cf = dma_pool_zalloc(re_chan->re_dev->cf_desc_pool, GFP_KERNEL, + &paddr); if (!cf) { kfree(desc); break; -- 2.55.0