From db176529529c142333f668f2c1334753f7f406bf Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Wed, 9 Nov 2005 00:04:15 +0000
Subject: [PATCH] Include checks for mmap() returning NULL

---
 common/textfile.c | 4 ++--
 tools/csr.c       | 2 +-
 tools/oui.c       | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/common/textfile.c b/common/textfile.c
index dd77980cf..b21345623 100644
--- a/common/textfile.c
+++ b/common/textfile.c
@@ -149,7 +149,7 @@ int textfile_put(char *pathname, char *key, char *value)
 	}
 
 	map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, fd, 0);
-	if (map == MAP_FAILED) {
+	if (!map || map == MAP_FAILED) {
 		err = errno;
 		goto unlock;
 	}
@@ -243,7 +243,7 @@ char *textfile_get(char *pathname, char *key)
 	size = st.st_size;
 
 	map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
-	if (map == MAP_FAILED) {
+	if (!map || map == MAP_FAILED) {
 		err = errno;
 		goto unlock;
 	}
diff --git a/tools/csr.c b/tools/csr.c
index 698122dcc..3f6717400 100644
--- a/tools/csr.c
+++ b/tools/csr.c
@@ -2697,7 +2697,7 @@ int psr_read(const char *filename)
 	}
 
 	map = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
-	if (map == MAP_FAILED) {
+	if (!map || map == MAP_FAILED) {
 		err = -errno;
 		goto close;
 	}
diff --git a/tools/oui.c b/tools/oui.c
index 0a1d67bcb..6ebf91a5d 100644
--- a/tools/oui.c
+++ b/tools/oui.c
@@ -65,7 +65,7 @@ char *ouitocomp(const char *oui)
 	memset(str, 0, 128);
 
 	map = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
-	if (map == MAP_FAILED) {
+	if (!map || map == MAP_FAILED) {
 		free(str);
 		close(fd);
 		return NULL;