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Sun, 21 Dec 2025 07:33:01 -0800 (PST) Received: from prometheus ([85.11.110.37]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-64b916adc61sm7629741a12.31.2025.12.21.07.33.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Dec 2025 07:33:01 -0800 (PST) From: Szymon Wilczek To: sumit.semwal@linaro.org, christian.koenig@amd.com Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, Szymon Wilczek , syzbot+4317d7108e14e5d56308@syzkaller.appspotmail.com Subject: [PATCH] dma-buf: fix WARNING in dma_buf_vmap Date: Sun, 21 Dec 2025 16:32:50 +0100 Message-ID: <20251221153250.17591-1-swilczek.lx@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When a driver's vmap callback returns an error (e.g. -ENOMEM), dma_buf_vmap= () triggers a WARN_ON_ONCE(). This is incorrect as vmap operations can legitim= ately fail due to resource exhaustion or other transient conditions, as documente= d. Fix this by removing the WARN_ON_ONCE(). The error code is already correctly propagated to the caller. Reported-by: syzbot+4317d7108e14e5d56308@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D4317d7108e14e5d56308 Signed-off-by: Szymon Wilczek --- drivers/dma-buf/dma-buf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index edaa9e4ee4ae..14b55f67ee1c 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1525,7 +1525,7 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys= _map *map) BUG_ON(iosys_map_is_set(&dmabuf->vmap_ptr)); =20 ret =3D dmabuf->ops->vmap(dmabuf, &ptr); - if (WARN_ON_ONCE(ret)) + if (ret) return ret; =20 dmabuf->vmap_ptr =3D ptr; --=20 2.52.0