linux-kernel - [PATCH V2 2/2] scripts: dtc: fix memory leak after realloc

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Message-Id: <1460494500-26922-3-git-send-email-mussitantesmortem@gmail.com>
Date:	Tue, 12 Apr 2016 23:55:00 +0300
From:	Maxim Zhukov <mussitantesmortem@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Michal Marek <mmarek@...e.com>, Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Maxim Zhukov <mussitantesmortem@...il.com>,
	devicetree-compiler@...r.kernel.org
Subject: [PATCH V2 2/2] scripts: dtc: fix memory leak after realloc

This commit fixed memory leak after errors realloc.

Signed-off-by: Maxim Zhukov <mussitantesmortem@...il.com>
---
 scripts/dtc/fdtput.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/scripts/dtc/fdtput.c b/scripts/dtc/fdtput.c
index f2197f5..1042319 100644
--- a/scripts/dtc/fdtput.c
+++ b/scripts/dtc/fdtput.c
@@ -75,8 +75,9 @@ static int encode_value(struct display_info *disp, char **arg, int arg_count,
 	char *ptr;		/* pointer to current value position */
 	int len;		/* length of this cell/string/byte */
 	int ival;
-	int upto;	/* the number of bytes we have written to buf */
+	int upto;		/* the number of bytes we have written to buf */
 	char fmt[3];
+	void *save_ptr = NULL;	/* save pointer to realloc */
 
 	upto = 0;
 
@@ -96,12 +97,15 @@ static int encode_value(struct display_info *disp, char **arg, int arg_count,
 		/* enlarge our value buffer by a suitable margin if needed */
 		if (upto + len > value_size) {
 			value_size = (upto + len) + 500;
-			value = realloc(value, value_size);
-			if (!value) {
+			void *save_ptr = realloc(value, value_size);
+
+			if (!save_ptr) {
+				free(value);
 				fprintf(stderr, "Out of mmory: cannot alloc "
 					"%d bytes\n", value_size);
 				return -1;
 			}
+			value = save_ptr;
 		}
 
 		ptr = value + upto;
-- 
2.7.1.1.g3617aa0