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Avoided merging runlists with no runs 

Runlists with no runs are tolerated though not expected. However merging
such runlists is problematic as there is no significant vcn to examine.
So avoid merging them, and just return the other runlist.
edge
Jean-Pierre André 2022-09-14 08:31:31 +02:00
parent 18bfc67611
commit 76c3a799a9
1 changed files with 7 additions and 2 deletions
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9
libntfs-3g/runlist.c
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@ -994,13 +994,18 @@ mpa_err:
rl[rlpos].vcn = vcn;
rl[rlpos].length = (s64)0;
/* If no existing runlist was specified, we are done. */
if (!old_rl) {
if (!old_rl || !old_rl[0].length) {
ntfs_log_debug("Mapping pairs array successfully decompressed:\n");
ntfs_debug_runlist_dump(rl);
if (old_rl)
free(old_rl);
return rl;
}
/* Now combine the new and old runlists checking for overlaps. */
old_rl = ntfs_runlists_merge(old_rl, rl);
if (rl[0].length)
old_rl = ntfs_runlists_merge(old_rl, rl);
else
free(rl);
if (old_rl)
return old_rl;
err = errno;