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From 50e7a021314aa0365c9c85a359a31f26313fe93b Mon Sep 17 00:00:00 2001
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From: Vishal Verma <vishal.l.verma@intel.com>
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Date: Thu, 2 Jun 2022 09:44:27 -0600
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Subject: [PATCH 171/217] libcxl: fix a segfault when memdev->pmem is absent
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A CXL memdev may not have any persistent capacity, and in this case it
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is possible that a 'pmem' object never gets instantiated. Such a
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scenario would cause free_pmem () to dereference a NULL pointer and
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segfault.
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Fix this by only proceeding in free_pmem() if 'pmem' was valid.
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Link: https://lore.kernel.org/r/20220602154427.462852-1-vishal.l.verma@intel.com
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Fixes: cd1aed6cefe8 ("libcxl: add representation for an nvdimm bridge object")
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Cc: Dan Williams <dan.j.williams@intel.com>
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Reported-by: Steven Garcia <steven.garcia@intel.com>
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Tested-by: Steven Garcia <steven.garcia@intel.com>
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Reviewed-by: Alison Schofield <alison.schofield@intel.com>
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Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
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---
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cxl/lib/libcxl.c | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
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index 374b0f1..c988ce2 100644
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--- a/cxl/lib/libcxl.c
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+++ b/cxl/lib/libcxl.c
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@@ -49,9 +49,11 @@ struct cxl_ctx {
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static void free_pmem(struct cxl_pmem *pmem)
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{
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- free(pmem->dev_buf);
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- free(pmem->dev_path);
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- free(pmem);
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+ if (pmem) {
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+ free(pmem->dev_buf);
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+ free(pmem->dev_path);
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+ free(pmem);
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+ }
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}
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static void free_memdev(struct cxl_memdev *memdev, struct list_head *head)
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--
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2.27.0
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