linux-kernel - [lustre cleanups 2/6] Fix set-but-unused whinge.

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Message-Id: <1449007519-73974-3-git-send-email-Valdis.Kletnieks@vt.edu>
Date:	Tue,  1 Dec 2015 17:05:15 -0500
From:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
To:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>
Cc:	lustre-devel@...ts.lustre.org, linux-kernel@...r.kernel.org,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Subject: [lustre cleanups 2/6] Fix set-but-unused whinge.

drivers/staging/lustre/lustre/fid/lproc_fid.c: In function 'ldebugfs_fid_write_common':
drivers/staging/lustre/lustre/fid/lproc_fid.c:67:6: warning: variable 'rc' set but not used [-Wunused-but-set-variable]
  int rc;

We fix it by *using* the return code to help bulletproof it.  It says it's
test code - it should be *more* bulletproof than production, not less.

Signed-off-by: Valdis Kletnieks <Valdis.Kletnieks@...edu>
---
diff --git a/drivers/staging/lustre/lustre/fid/lproc_fid.c b/drivers/staging/lustre/lustre/fid/lproc_fid.c
index ce90c1c54a63..eff011f30fa5 100644
--- a/drivers/staging/lustre/lustre/fid/lproc_fid.c
+++ b/drivers/staging/lustre/lustre/fid/lproc_fid.c
@@ -85,6 +85,8 @@ ldebugfs_fid_write_common(const char __user *buffer, size_t count,
 	rc = sscanf(kernbuf, "[%llx - %llx]\n",
 		    (unsigned long long *)&tmp.lsr_start,
 		    (unsigned long long *)&tmp.lsr_end);
+	if (rc != 2)
+		return -EINVAL;
 	if (!range_is_sane(&tmp) || range_is_zero(&tmp) ||
 	    tmp.lsr_start < range->lsr_start || tmp.lsr_end > range->lsr_end)
 		return -EINVAL;
-- 
2.6.3

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