[v18] Fix panic in Firestore backend#56036
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rosstimothy merged 1 commit intobranch/v18from Jun 24, 2025
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```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x5af856fc3494]
goroutine 62984 [running]:
github.com/gravitational/teleport/lib/backend/firestore.(*Backend).Items.func3-range1(0xc0001991f0, {0x0?, 0x0?})
github.com/gravitational/teleport/lib/backend/firestore/firestorebk.go:586 +0x134
github.com/gravitational/teleport/lib/backend/firestore.(*Backend).Items.func3.(*Backend).mergedRecords.2-range1(0x5af85ed273a0?, {0x0, 0x0?})
github.com/gravitational/teleport/lib/backend/firestore/firestorebk.go:655 +0x4f
github.com/gravitational/teleport/lib/itertools/stream.MergeStreams[...].func1()
github.com/gravitational/teleport/lib/itertools/stream/stream.go:378 +0x236
github.com/gravitational/teleport/lib/backend/firestore.(*Backend).Items.func3.(*Backend).mergedRecords.2(0xc000e52500)
github.com/gravitational/teleport/lib/backend/firestore/firestorebk.go:654 +0x89b
github.com/gravitational/teleport/lib/backend/firestore.(*Backend).Items.func3(0xc003bb4cc0)
github.com/gravitational/teleport/lib/backend/firestore/firestorebk.go:579 +0x3bf
```
The above panic is caused by the snapShot not being set and thus
resulting in a nil dereference. The snapShot is now assigned outside
of the switch to ensure that all records that are successfully
created contain a reference to a valid DocumentSnapshot.
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Backport #56030 to branch/v18