From d9eff33ce203a9010067a15ddf1d279132abf437 Mon Sep 17 00:00:00 2001
From: Kamil Rytarowski <n54@gmx.com>
Date: Sat, 11 May 2013 14:40:19 +0200
Subject: [PATCH] Always check the return number of asprintf

asprintf prints to an allocated string. When  successful,  the
functions return the number of bytes printed. If memory allocation
wasn't possible, or some other error occurs, the function will return
-1.

Don't check strp as a result of asprintf, it's content may be undefined.

man 3 asprintf
---
 install/dracut-install.c | 59 +++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 11 deletions(-)

diff --git a/install/dracut-install.c b/install/dracut-install.c
index 0b9502e..c8328b0 100644
--- a/install/dracut-install.c
+++ b/install/dracut-install.c
@@ -83,6 +83,7 @@ static char *convert_abs_rel(const char *from, const char *target)
         size_t level = 0, fromlevel = 0, targetlevel = 0;
         int l;
         size_t i, rl, dirlen;
+        int ret;
 
         target_dir_p = strdup(target);
         if (!target_dir_p)
@@ -103,7 +104,11 @@ static char *convert_abs_rel(const char *from, const char *target)
         for (i = dirlen+1; i < rl; ++i)
             if (target_dir_p[i] != '/')
                 break;
-        asprintf(&realtarget, "%s/%s", realpath_p, &target_dir_p[i]);
+        ret = asprintf(&realtarget, "%s/%s", realpath_p, &target_dir_p[i]);
+        if (ret < 0) {
+                log_error("Out of memory!");
+                exit(EXIT_FAILURE);
+        }
 
         /* now calculate the relative path from <from> to <target> and
            store it in <relative_from>
@@ -282,8 +287,11 @@ static int resolve_deps(const char *src)
 
         /* run ldd */
         ret = asprintf(&cmd, "ldd %s 2>&1", src);
-        if (ret < 0)
-                return ret;
+        if (ret < 0) {
+                log_error("Out of memory!");
+                exit(EXIT_FAILURE);
+        }
+
         ret = 0;
 
         fptr = popen(cmd, "r");
@@ -352,6 +360,7 @@ static int hmac_install(const char *src, const char *dst, const char *hmacpath)
         _cleanup_free_ char *dstpath = strdup(dst);
         _cleanup_free_ char *srchmacname = NULL;
         _cleanup_free_ char *dsthmacname = NULL;
+        int ret;
 
         if (!(srcpath && dstpath))
                 return -ENOMEM;
@@ -371,11 +380,29 @@ static int hmac_install(const char *src, const char *dst, const char *hmacpath)
         srcpath[dlen] = '\0';
         dstpath[dir_len(dst)] = '\0';
         if (hmacpath) {
-                asprintf(&srchmacname, "%s/%s.hmac", hmacpath, &src[dlen + 1]);
-                asprintf(&dsthmacname, "%s/%s.hmac", hmacpath, &src[dlen + 1]);
+                ret = asprintf(&srchmacname, "%s/%s.hmac", hmacpath, &src[dlen + 1]);
+                if (ret < 0) {
+                        log_error("Out of memory!");
+                        exit(EXIT_FAILURE);
+                }
+
+                ret = asprintf(&dsthmacname, "%s/%s.hmac", hmacpath, &src[dlen + 1]);
+                if (ret < 0) {
+                        log_error("Out of memory!");
+                        exit(EXIT_FAILURE);
+                }
         } else {
-                asprintf(&srchmacname, "%s/.%s.hmac", srcpath, &src[dlen + 1]);
-                asprintf(&dsthmacname, "%s/.%s.hmac", dstpath, &src[dlen + 1]);
+                ret = asprintf(&srchmacname, "%s/.%s.hmac", srcpath, &src[dlen + 1]);
+                if (ret < 0) {
+                        log_error("Out of memory!");
+                        exit(EXIT_FAILURE);
+                }
+
+                ret = asprintf(&dsthmacname, "%s/.%s.hmac", dstpath, &src[dlen + 1]);
+                if (ret < 0) {
+                        log_error("Out of memory!");
+                        exit(EXIT_FAILURE);
+                }
         }
         log_debug("hmac cp '%s' '%s')", srchmacname, dsthmacname);
         dracut_install(srchmacname, dsthmacname, false, false, true);
@@ -428,7 +455,11 @@ static int dracut_install(const char *src, const char *dst, bool isdir, bool res
 
         hashmap_put(items, i, i);
 
-        asprintf(&fulldstpath, "%s%s", destrootdir, dst);
+        ret = asprintf(&fulldstpath, "%s%s", destrootdir, dst);
+        if (ret < 0) {
+                log_error("Out of memory!");
+                exit(EXIT_FAILURE);
+        }
 
         ret = stat(fulldstpath, &sb);
 
@@ -511,7 +542,11 @@ static int dracut_install(const char *src, const char *dst, bool isdir, bool res
                 if (lstat(fulldstpath, &sb) != 0) {
                         _cleanup_free_ char *absdestpath = NULL;
 
-                        asprintf(&absdestpath, "%s%s", destrootdir, abspath);
+                        ret = asprintf(&absdestpath, "%s%s", destrootdir, abspath);
+                        if (ret < 0) {
+                                log_error("Out of memory!");
+                                exit(EXIT_FAILURE);
+                        }
 
                         ln_r(absdestpath, fulldstpath);
                 }
@@ -704,6 +739,8 @@ static char *find_binary(const char *src)
         char *p, *q;
         bool end = false;
         char *newsrc = NULL;
+        int ret;
+
         path = getenv("PATH");
 
         if (path == NULL) {
@@ -730,8 +767,8 @@ static char *find_binary(const char *src)
                 else
                         *q = '\0';
 
-                asprintf(&newsrc, "%s/%s", p, src);
-                if (newsrc == NULL) {
+                ret = asprintf(&newsrc, "%s/%s", p, src);
+                if (ret < 0) {
                         log_error("Out of memory!");
                         exit(EXIT_FAILURE);
                 }