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From: Vishal Verma <vishal.l.verma@intel.com>
To: linux-nvdimm@lists.01.org
Subject: [ndctl PATCH 1/2] ndctl: fix potential null dereference in the smart error handler
Date: Fri, 10 Aug 2018 18:40:52 -0600	[thread overview]
Message-ID: <20180811004053.15392-1-vishal.l.verma@intel.com> (raw)

Static analysis reports that can potentially dereference a NULL pointer
in the smart cmd error handler. This can particular instance won't ever
be hit in practice as the handler is only registered for smart commands,
and smart commands are currently only DIMM commands, and will always
have a dimm object. However for completeness, and to avoid future
errors, we should perform a NULL check in the handler anyway.

Cc: Keith Busch <keith.busch@intel.com>
Fixes: ba17700bf227 ("ndctl, intel: Fallback to smart cached shutdown_count")
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 ndctl/lib/intel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ndctl/lib/intel.c b/ndctl/lib/intel.c
index 00c65a5..b1254bb 100644
--- a/ndctl/lib/intel.c
+++ b/ndctl/lib/intel.c
@@ -67,6 +67,9 @@ static int intel_smart_handle_error(struct ndctl_cmd *cmd)
 	char *path = NULL, shutdown_count[16] = {};
 	int fd, rc = cmd->status;
 
+	if (!dimm)
+		return 0;
+
 	if (asprintf(&path, DEF_TMPFS_DIR "/%s/usc",
 		     ndctl_dimm_get_devname(dimm)) < 0)
 		return rc;
-- 
2.14.4

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             reply	other threads:[~2018-08-11  0:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-11  0:40 Vishal Verma [this message]
2018-08-11  0:40 ` [ndctl PATCH 2/2] ndctl, udev: fix a resource leak in save_unsafe_shutdown_count Vishal Verma
2018-08-13 14:29 ` [ndctl PATCH 1/2] ndctl: fix potential null dereference in the smart error handler Keith Busch

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