From: Eric Wong <normalperson@yhbt.net>
Date: Sat, 3 Apr 2010 05:59:54 +0000 (-0700)
Subject: mincore: mmap() returns MAP_FAILED on failure
X-Git-Tag: v0.3.0~6
X-Git-Url: https://repo.or.cz/w/pcu.git/commitdiff_plain/d791dcdbc49667257af79ca9329ba83d1b934b88

mincore: mmap() returns MAP_FAILED on failure

mmap() may return NULL on success in certain situations not
applicable to us.  The proper failure value is MAP_FAILED.
---

diff --git a/mincore.c b/mincore.c
index 3314d3c..4bdbd0c 100644
--- a/mincore.c
+++ b/mincore.c
@@ -45,7 +45,7 @@ static void mincore_stats(const char *path, off_t offset, off_t len)
 	map_offset = PAGE_ALIGN_DOWN(offset + 1);
 
 	map = mmap(NULL, map_len, PROT_READ, MAP_SHARED, fd, map_offset);
-	if (!map) {
+	if (map == MAP_FAILED) {
 		fprintf(stderr, "%s: mmap(%lu): %s\n",
 		        path, (unsigned long)vec_len, strerror(errno));
 		goto err_free;