netdev - [ethtool PATCH v4 02/11] ethtool.c: don't ignore fread() return value

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Message-Id: <1457719104-39188-3-git-send-email-ddecotig@gmail.com>
Date:	Fri, 11 Mar 2016 09:58:15 -0800
From:	David Decotigny <ddecotig@...il.com>
To:	netdev@...r.kernel.org
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	David Miller <davem@...hat.com>,
	Vidya Sagar Ravipati <vidya@...ulusnetworks.com>,
	Joe Perches <joe@...ches.com>,
	David Decotigny <decot@...glers.com>
Subject: [ethtool PATCH v4 02/11] ethtool.c: don't ignore fread() return value

From: David Decotigny <decot@...glers.com>

This addresses:
  ethtool.c:1116:8: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]


Signed-off-by: David Decotigny <decot@...glers.com>
---
 ethtool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ethtool.c b/ethtool.c
index 92c40b8..9f80d5f 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -1007,6 +1007,7 @@ static int dump_regs(int gregs_dump_raw, int gregs_dump_hex,
 	if (gregs_dump_file) {
 		FILE *f = fopen(gregs_dump_file, "r");
 		struct stat st;
+		size_t nread;
 
 		if (!f || fstat(fileno(f), &st) < 0) {
 			fprintf(stderr, "Can't open '%s': %s\n",
@@ -1016,8 +1017,10 @@ static int dump_regs(int gregs_dump_raw, int gregs_dump_hex,
 
 		regs = realloc(regs, sizeof(*regs) + st.st_size);
 		regs->len = st.st_size;
-		fread(regs->data, regs->len, 1, f);
+		nread = fread(regs->data, regs->len, 1, f);
 		fclose(f);
+		if (nread != 1)
+			return -1;
 	}
 
 	if (!gregs_dump_hex)
-- 
2.7.0.rc3.207.g0ac5344