diff options
Diffstat (limited to 'util-linux/volume_id/util.c')
| -rw-r--r-- | util-linux/volume_id/util.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/util-linux/volume_id/util.c b/util-linux/volume_id/util.c index 315d75c..c4d20ba 100644 --- a/util-linux/volume_id/util.c +++ b/util-linux/volume_id/util.c @@ -181,7 +181,7 @@ set: buf[4], buf[5], buf[6], buf[7], buf[8], buf[9], - buf[10], buf[11], buf[12], buf[13], buf[14],buf[15]); + buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]); break; case UUID_DCE_STRING: memcpy(id->uuid, buf, count); @@ -190,6 +190,9 @@ set: } } +/* Do not use xlseek here. With it, single corrupted filesystem + * may result in attempt to seek past device -> exit. + * It's better to ignore such fs and continue. */ void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len) { ssize_t buf_len; @@ -204,7 +207,10 @@ void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len) /* check if we need to read */ if ((off + len) > id->sbbuf_len) { dbg("read sbbuf len:0x%llx", (unsigned long long) (off + len)); - xlseek(id->fd, 0, SEEK_SET); + if (lseek(id->fd, 0, SEEK_SET) != 0) { + dbg("seek(0) failed"); + return NULL; + } buf_len = full_read(id->fd, id->sbbuf, off + len); if (buf_len < 0) { dbg("read failed (%s)", strerror(errno)); @@ -234,7 +240,10 @@ void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len) /* check if we need to read */ if ((off < id->seekbuf_off) || ((off + len) > (id->seekbuf_off + id->seekbuf_len))) { dbg("read seekbuf off:0x%llx len:0x%zx", (unsigned long long) off, len); - xlseek(id->fd, off, SEEK_SET); + if (lseek(id->fd, off, SEEK_SET) != off) { + dbg("seek(0x%llx) failed", (unsigned long long) off); + return NULL; + } buf_len = full_read(id->fd, id->seekbuf, len); if (buf_len < 0) { dbg("read failed (%s)", strerror(errno)); |