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lib/model: Don't crash when taking rename shortcut (fixes #6654) #6657

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merged 1 commit into from
May 17, 2020
Merged

lib/model: Don't crash when taking rename shortcut (fixes #6654) #6657

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17 changes: 11 additions & 6 deletions lib/model/folder_sendrecv.go
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Original file line number Diff line number Diff line change
Expand Up @@ -460,12 +460,7 @@ nextFile:
// Check our list of files to be removed for a match, in which case
// we can just do a rename instead.
key := string(fi.BlocksHash)
for i, candidate := range buckets[key] {
// Remove the candidate from the bucket
lidx := len(buckets[key]) - 1
buckets[key][i] = buckets[key][lidx]
buckets[key] = buckets[key][:lidx]

for candidate, ok := popCandidate(buckets, key); ok; candidate, ok = popCandidate(buckets, key) {
// candidate is our current state of the file, where as the
// desired state with the delete bit set is in the deletion
// map.
Expand Down Expand Up @@ -498,6 +493,16 @@ nextFile:
return changed, fileDeletions, dirDeletions, nil
}

func popCandidate(buckets map[string][]protocol.FileInfo, key string) (protocol.FileInfo, bool) {
cands := buckets[key]
if len(cands) == 0 {
return protocol.FileInfo{}, false
}

buckets[key] = cands[1:]
return cands[0], true
}

func (f *sendReceiveFolder) processDeletions(fileDeletions map[string]protocol.FileInfo, dirDeletions []protocol.FileInfo, snap *db.Snapshot, dbUpdateChan chan<- dbUpdateJob, scanChan chan<- string) {
for _, file := range fileDeletions {
select {
Expand Down