linux-kernel - [PATCH v2 1/2] cxl/cdat: Handle cdat table build errors

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Message-Id: <20231117-fix-cdat-cs-v2-1-715399976d4d@intel.com>
Date:   Wed, 29 Nov 2023 17:33:03 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Jonathan Cameron <jonathan.cameron@...wei.com>,
        Fan Ni <nifan.cxl@...il.com>
Cc:     Dave Jiang <dave.jiang@...el.com>, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>,
        Huai-Cheng Kuo <hchkuo@...ry-design.com.tw>
Subject: [PATCH v2 1/2] cxl/cdat: Handle cdat table build errors

The callback for building CDAT tables may return negative error codes.
This was previously unhandled and will result in potentially huge
allocations later on in ct3_build_cdat()

Detect the negative error code and defer cdat building.

Fixes: f5ee7413d592 ("hw/mem/cxl-type3: Add CXL CDAT Data Object Exchange")
Cc: Huai-Cheng Kuo <hchkuo@...ry-design.com.tw>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 hw/cxl/cxl-cdat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/cxl/cxl-cdat.c b/hw/cxl/cxl-cdat.c
index 639a2db3e17b..24829cf2428d 100644
--- a/hw/cxl/cxl-cdat.c
+++ b/hw/cxl/cxl-cdat.c
@@ -63,7 +63,7 @@ static void ct3_build_cdat(CDATObject *cdat, Error **errp)
     cdat->built_buf_len = cdat->build_cdat_table(&cdat->built_buf,
                                                  cdat->private);
 
-    if (!cdat->built_buf_len) {
+    if (cdat->built_buf_len <= 0) {
         /* Build later as not all data available yet */
         cdat->to_update = true;
         return;

-- 
2.42.0