From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E83A63E0092; Fri, 15 May 2026 16:28:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862524; cv=none; b=DGVoZj2V3erYoBfKqZsUQ46wIvykbxvvm+FayVtW2/xqRltytgJABVJKIbglbRkOK/t3IEJ1geDCzmRVQ1UfQczkm/JSox+8mcnhV0ajNX6i7jM+NZ6n9BBuj9/q5GsXmnVzl6cfypaLFNJc3RSe8X4Dj2maTU88srf21rM3g1M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862524; c=relaxed/simple; bh=5Ydec4jVfZflJ9BMnefuWdvBDNKx6ZJKfjKbj3dC8Io=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oeMFiNatblfWwB9DpiQgQ6uQjvqRnCacGAx3X0Qb5YPj7wRXZb1vHkMXES7qAm4/kB63C9CYLk8S8W9DToluUbu3LFQlgNZlkMNA2TTmY31I/nD0zmmfs4hYkVsVERi+w0jqISQDgwc6t7cqX3hMVg8YuL1jACfh+yuhuJePzVs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GVT93bpj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="GVT93bpj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D720C2BCB0; Fri, 15 May 2026 16:28:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778862523; bh=5Ydec4jVfZflJ9BMnefuWdvBDNKx6ZJKfjKbj3dC8Io=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GVT93bpjBKlHjn0gR24fbcLTv7svGHmV6/f2hwlHVbJBwHbUgRPkm/2f+jHfPlYib pmd4DqQktJi4dmZA77hgiu/ADRgzkobtsjvYs5orWg5XJca0pltHPdXlmB5AJLi2E1 1oUl6s/IAu0YObmNRhJlnh2HWZU58EWSAenUeZ8w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vikash Garodia , Vishnu Reddy , Dikshita Agarwal , Bryan ODonoghue , Hans Verkuil Subject: [PATCH 7.0 079/201] media: iris: fix use-after-free of fmt_src during MBPF check Date: Fri, 15 May 2026 17:48:17 +0200 Message-ID: <20260515154700.243844154@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260515154658.538039039@linuxfoundation.org> References: <20260515154658.538039039@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vishnu Reddy commit 3d9593ad1a58c5acc3e5fa2a48222bb7632e6812 upstream. During concurrency testing, multiple instances can run in parallel, and each instance uses its own inst->lock while the core->lock protects the list of active instances. The race happens because these locks cover different scopes, inst->lock protects only the internals of a single instance, while the Macro Blocks Per Frame (MBPF) checker walks the core list under core->lock and reads fields like fmt_src->width and fmt_src->height. At the same time, iris_close() may free fmt_src and fmt_dst under inst->lock while the instance is still present in the core list. This allows a situation where the MBPF checker, still iterating through the core list, reaches an instance whose fmt_src was already freed by another thread and ends up dereferencing a dangling pointer, resulting in a use-after-free. This happens because the MBPF checker assumes that any instance in the core list is fully valid, but the freeing of fmt_src and fmt_dst without removing the instance from the core list is not correct. The correct ordering is to defer freeing fmt_src and fmt_dst until after the instance has been removed from the core list and all teardown under the core lock has completed, ensuring that no dangling pointers are ever exposed during MBPF checks. Reviewed-by: Vikash Garodia Signed-off-by: Vishnu Reddy Reviewed-by: Dikshita Agarwal Fixes: 5ad964ad5656 ("media: iris: Initialize and deinitialize encoder instance structure") Cc: stable@vger.kernel.org Signed-off-by: Bryan O'Donoghue Signed-off-by: Hans Verkuil Signed-off-by: Greg Kroah-Hartman --- drivers/media/platform/qcom/iris/iris_vdec.c | 6 ------ drivers/media/platform/qcom/iris/iris_vdec.h | 1 - drivers/media/platform/qcom/iris/iris_venc.c | 6 ------ drivers/media/platform/qcom/iris/iris_venc.h | 1 - drivers/media/platform/qcom/iris/iris_vidc.c | 6 ++---- 5 files changed, 2 insertions(+), 18 deletions(-) --- a/drivers/media/platform/qcom/iris/iris_vdec.c +++ b/drivers/media/platform/qcom/iris/iris_vdec.c @@ -61,12 +61,6 @@ int iris_vdec_inst_init(struct iris_inst return iris_ctrls_init(inst); } -void iris_vdec_inst_deinit(struct iris_inst *inst) -{ - kfree(inst->fmt_dst); - kfree(inst->fmt_src); -} - static const struct iris_fmt iris_vdec_formats_cap[] = { [IRIS_FMT_NV12] = { .pixfmt = V4L2_PIX_FMT_NV12, --- a/drivers/media/platform/qcom/iris/iris_vdec.h +++ b/drivers/media/platform/qcom/iris/iris_vdec.h @@ -9,7 +9,6 @@ struct iris_inst; int iris_vdec_inst_init(struct iris_inst *inst); -void iris_vdec_inst_deinit(struct iris_inst *inst); int iris_vdec_enum_fmt(struct iris_inst *inst, struct v4l2_fmtdesc *f); int iris_vdec_try_fmt(struct iris_inst *inst, struct v4l2_format *f); int iris_vdec_s_fmt(struct iris_inst *inst, struct v4l2_format *f); --- a/drivers/media/platform/qcom/iris/iris_venc.c +++ b/drivers/media/platform/qcom/iris/iris_venc.c @@ -79,12 +79,6 @@ int iris_venc_inst_init(struct iris_inst return iris_ctrls_init(inst); } -void iris_venc_inst_deinit(struct iris_inst *inst) -{ - kfree(inst->fmt_dst); - kfree(inst->fmt_src); -} - static const struct iris_fmt iris_venc_formats_cap[] = { [IRIS_FMT_H264] = { .pixfmt = V4L2_PIX_FMT_H264, --- a/drivers/media/platform/qcom/iris/iris_venc.h +++ b/drivers/media/platform/qcom/iris/iris_venc.h @@ -9,7 +9,6 @@ struct iris_inst; int iris_venc_inst_init(struct iris_inst *inst); -void iris_venc_inst_deinit(struct iris_inst *inst); int iris_venc_enum_fmt(struct iris_inst *inst, struct v4l2_fmtdesc *f); int iris_venc_try_fmt(struct iris_inst *inst, struct v4l2_format *f); int iris_venc_s_fmt(struct iris_inst *inst, struct v4l2_format *f); --- a/drivers/media/platform/qcom/iris/iris_vidc.c +++ b/drivers/media/platform/qcom/iris/iris_vidc.c @@ -289,10 +289,6 @@ int iris_close(struct file *filp) v4l2_m2m_ctx_release(inst->m2m_ctx); v4l2_m2m_release(inst->m2m_dev); mutex_lock(&inst->lock); - if (inst->domain == DECODER) - iris_vdec_inst_deinit(inst); - else if (inst->domain == ENCODER) - iris_venc_inst_deinit(inst); iris_session_close(inst); iris_inst_change_state(inst, IRIS_INST_DEINIT); iris_v4l2_fh_deinit(inst, filp); @@ -304,6 +300,8 @@ int iris_close(struct file *filp) mutex_unlock(&inst->lock); mutex_destroy(&inst->ctx_q_lock); mutex_destroy(&inst->lock); + kfree(inst->fmt_src); + kfree(inst->fmt_dst); kfree(inst); return 0;