package/libs/sysfsutils/patches/200-mnt_path_check.patch

   1 --- a/lib/sysfs_utils.c
   2 +++ b/lib/sysfs_utils.c
   3 @@ -22,6 +22,7 @@
   4   */
   5  #include "libsysfs.h"
   6  #include "sysfs.h"
   7 +#include <mntent.h>
   8
   9  /**
  10   * sysfs_remove_trailing_slash: Removes any trailing '/' in the given path
  11 @@ -53,6 +54,9 @@ int sysfs_get_mnt_path(char *mnt_path, s
  12  {
  13         static char sysfs_path[SYSFS_PATH_MAX] = "";
  14         const char *sysfs_path_env;
  15 +       FILE *mnt;
  16 +       struct mntent *mntent;
  17 +       int ret;
  18
  19         if (len == 0 || mnt_path == NULL)
  20                 return -1;
  21 @@ -64,12 +68,31 @@ int sysfs_get_mnt_path(char *mnt_path, s
  22                 if (sysfs_path_env != NULL) {
  23                         safestrcpymax(mnt_path, sysfs_path_env, len);
  24                         sysfs_remove_trailing_slash(mnt_path);
  25 -                       return 0;
  26 +               } else {
  27 +                       safestrcpymax(mnt_path, SYSFS_MNT_PATH, len);
  28                 }
  29 -               safestrcpymax(mnt_path, SYSFS_MNT_PATH, len);
  30         }
  31
  32 -       return 0;
  33 +       /* check that mount point is indeed mounted */
  34 +       ret = -1;
  35 +       if ((mnt = setmntent(SYSFS_PROC_MNTS, "r")) == NULL) {
  36 +               dprintf("Error getting mount information\n");
  37 +               return -1;
  38 +       }
  39 +       while ((mntent = getmntent(mnt)) != NULL) {
  40 +               if (strcmp(mntent->mnt_type, SYSFS_FSTYPE_NAME) == 0 &&
  41 +                       strcmp(mntent->mnt_dir, mnt_path) == 0) {
  42 +                       ret = 0;
  43 +                       break;
  44 +               }
  45 +       }
  46 +
  47 +       endmntent(mnt);
  48 +
  49 +       if (ret < 0)
  50 +               errno = ENOENT;
  51 +
  52 +       return ret;
  53  }
  54
  55  /**