diff options
| -rw-r--r-- | disk-io.c | 10 |
1 files changed, 10 insertions, 0 deletions
@@ -1008,10 +1008,20 @@ int btrfs_scan_fs_devices(int fd, const char *path, u64 sb_bytenr, int super_recover) { u64 total_devs; + u64 dev_size; int ret; if (!sb_bytenr) sb_bytenr = BTRFS_SUPER_INFO_OFFSET; + dev_size = lseek(fd, 0, SEEK_END); + if (dev_size < 0) + return (int)(dev_size); + lseek(fd, 0, SEEK_SET); + if (sb_bytenr > dev_size) { + fprintf(stderr, "Superblock bytenr is larger than device size\n"); + return -EINVAL; + } + ret = btrfs_scan_one_device(fd, path, fs_devices, &total_devs, sb_bytenr, super_recover); if (ret) { |