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Thu, 07 May 2026 16:37:54 -0700 (PDT) Received: from localhost ([136.49.184.116]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7e367d8fd96sm78980a34.19.2026.05.07.16.37.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 16:37:53 -0700 (PDT) From: Aaron Esau To: linux-crypto@vger.kernel.org Cc: herbert@gondor.apana.org.au, davem@davemloft.net, stable@vger.kernel.org, linux-kernel@vger.kernel.org, Aaron Esau Subject: [PATCH] crypto: acomp - fix dst-folio branch setting src instead of dst in acomp_virt_to_sg Date: Thu, 7 May 2026 18:37:48 -0500 Message-ID: <20260507233748.327004-1-aaron1esau@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In acomp_virt_to_sg(), the dst_isfolio branch calls acomp_request_set_src_sg() instead of acomp_request_set_dst_sg(). This overwrites req->src with the destination folio SG and leaves req->dst holding a raw struct folio pointer (via the src/dst union). The algorithm then reads from the wrong buffer and dereferences the stale folio pointer as a scatterlist. The bug is reachable from UBIFS decompression on systems with a hardware compression accelerator (HiSilicon ZIP, Intel IAA, Intel QAT), where crypto_alloc_acomp() selects the hardware driver over scompress. Software scompress backends are unaffected because they set CRYPTO_ALG_REQ_CHAIN and bypass acomp_virt_to_sg() entirely. Fixes: 8a6771cda3f4 ("crypto: acomp - Add support for folios") Cc: stable@vger.kernel.org Signed-off-by: Aaron Esau --- crypto/acompress.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/acompress.c b/crypto/acompress.c index f7a3fbe54..5a8b0cf3a 100644 --- a/crypto/acompress.c +++ b/crypto/acompress.c @@ -237,7 +237,7 @@ static void acomp_virt_to_sg(struct acomp_req *req) sg_init_table(&state->dsg, 1); sg_set_page(&state->dsg, folio_page(folio, off / PAGE_SIZE), dlen, off % PAGE_SIZE); - acomp_request_set_src_sg(req, &state->dsg, dlen); + acomp_request_set_dst_sg(req, &state->dsg, dlen); } } -- 2.53.0