diff --git a/netwerk/cache2/CacheFile.cpp b/netwerk/cache2/CacheFile.cpp
index ebc1031863a..55d4ec92706 100644
--- a/netwerk/cache2/CacheFile.cpp
+++ b/netwerk/cache2/CacheFile.cpp
@@ -1925,7 +1925,12 @@ CacheFile::PadChunkWithZeroes(uint32_t aChunkIdx)
   LOG(("CacheFile::PadChunkWithZeroes() - Zeroing hole in chunk %d, range %d-%d"
        " [this=%p]", aChunkIdx, chunk->DataSize(), kChunkSize - 1, this));
 
-  chunk->EnsureBufSize(kChunkSize);
+  rv = chunk->EnsureBufSize(kChunkSize);
+  if (NS_FAILED(rv)) {
+    ReleaseOutsideLock(chunk.forget().take());
+    SetError(rv);
+    return rv;
+  }
   memset(chunk->BufForWriting() + chunk->DataSize(), 0, kChunkSize - chunk->DataSize());
 
   chunk->UpdateDataSize(chunk->DataSize(), kChunkSize - chunk->DataSize(),