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From cc2766399882001880a899e723c7bd968e60f100 Mon Sep 17 00:00:00 2001
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From: Vishal Verma <vishal.l.verma@intel.com>
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Date: Tue, 23 Aug 2022 01:45:25 -0600
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Subject: [PATCH 214/217] cxl/region: fix a dereferecnce after NULL check
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A NULL check in region_action() implies that 'decoder' might be NULL, but
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later we dereference it during cxl_decoder_foreach(). The NULL check is
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valid because it was the filter result being checked, however, while
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doing this, the original 'decoder' variable was being clobbered.
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Check the filter results independently of the original decoder variable.
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Link: https://lore.kernel.org/r/20220823074527.404435-2-vishal.l.verma@intel.com
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Cc: Dan Williams <dan.j.williams@intel.com>
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Reviewed-by: Dan Williams <dan.j.williams@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/region.c | 5 ++---
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1 file changed, 2 insertions(+), 3 deletions(-)
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diff --git a/cxl/region.c b/cxl/region.c
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index a30313c..334fcc2 100644
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--- a/cxl/region.c
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+++ b/cxl/region.c
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@@ -686,9 +686,8 @@ static int region_action(int argc, const char **argv, struct cxl_ctx *ctx,
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continue;
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cxl_decoder_foreach (port, decoder) {
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- decoder = util_cxl_decoder_filter(decoder,
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- param.root_decoder);
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- if (!decoder)
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+ if (!util_cxl_decoder_filter(decoder,
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+ param.root_decoder))
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continue;
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rc = decoder_region_action(p, decoder, action, count);
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if (rc)
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--
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2.27.0
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