vold: Handle wrong entries in vold.fstablinaro_android_4.2.1linaro_android_4.2

If the entry in vold.fstab doesn't exist then vold
is crashing in realpath where it tries to resolve
symlink.

Due to the crash in vold the system keeps restarting
vold and never completes the boot process.

This fixes the bugs:
https://bugs.launchpad.net/linaro-android/+bug/1048476
https://bugs.launchpad.net/linaro-android/+bug/1047964

Change-Id: I49a2da8c8813afcbf0dbaede6bc19dc987db61a6
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/main.cpp b/main.cpp
index f47681ce..04746aa4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -224,8 +224,14 @@ static int process_config(VolumeManager *vm) {
                  */
                 char sp[sizeof(line)] = "/sys";
                 strcat(sp, sysfs_path);
+                struct stat s;
+                int error = stat(sp, &s);
+                if (error == -1) {
+                    SLOGE("wrong entry in vold.fstab %s", sysfs_path);
+                    goto out_fail;
+                }
                 char *rp = realpath(sp, NULL);
-                int error = dv->addPath(rp + 4); /* Real path without '/sys' */
+                error = dv->addPath(rp + 4); /* Real path without '/sys' */
                 free(rp);
                 if (error) {
                     SLOGE("Failed to add devpath %s to volume %s", sysfs_path,