File fix-error-paths-in-mem_chunk.patch of Package dmidecode.28672

From: Jean Delvare <jdelvare@suse.de>
Date: Wed, 14 Oct 2015 14:37:09 +0200
Subject: Fix error paths in mem_chunk
Git-commit: 458f73d58c24a7addce82bf1e8bfb8c2554ca458
Patch-mainline: 3.1

Use a common error path in function mem_chunk, to make sure it does
not leak memory and does not leave an opened file descriptor behind,
without duplicating the cleaning code.
---
 util.c |   24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

--- a/util.c
+++ b/util.c
@@ -169,7 +169,7 @@ void *mem_chunk(off_t base, size_t len,
 	if ((p = malloc(len)) == NULL)
 	{
 		perror("malloc");
-		return NULL;
+		goto out;
 	}
 
 #ifdef USE_MMAP
@@ -177,8 +177,7 @@ void *mem_chunk(off_t base, size_t len,
 	{
 		fprintf(stderr, "%s: ", devmem);
 		perror("stat");
-		free(p);
-		return NULL;
+		goto err_free;
 	}
 
 	/*
@@ -189,8 +188,7 @@ void *mem_chunk(off_t base, size_t len,
 	{
 		fprintf(stderr, "mmap: Can't map beyond end of file %s\n",
 			devmem);
-		free(p);
-		return NULL;
+		goto err_free;
 	}
 
 #ifdef _SC_PAGESIZE
@@ -223,19 +221,17 @@ try_read:
 	{
 		fprintf(stderr, "%s: ", devmem);
 		perror("lseek");
-		free(p);
-		return NULL;
+		goto err_free;
 	}
 
-	if (myread(fd, p, len, devmem) == -1)
-	{
-		free(p);
-		return NULL;
-	}
+	if (myread(fd, p, len, devmem) == 0)
+		goto out;
+
+err_free:
+	free(p);
+	p = NULL;
 
-#ifdef USE_MMAP
 out:
-#endif
 	if (close(fd) == -1)
 		perror(devmem);