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-rw-r--r--src/backend/storage/ipc/shm_mq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/storage/ipc/shm_mq.c b/src/backend/storage/ipc/shm_mq.c
index 126cb0751b3..e765cea5aaa 100644
--- a/src/backend/storage/ipc/shm_mq.c
+++ b/src/backend/storage/ipc/shm_mq.c
@@ -584,7 +584,7 @@ shm_mq_receive(shm_mq_handle *mqh, Size *nbytesp, void **datap, bool nowait)
if (mqh->mqh_partial_bytes + rb > sizeof(Size))
lengthbytes = sizeof(Size) - mqh->mqh_partial_bytes;
else
- lengthbytes = rb - mqh->mqh_partial_bytes;
+ lengthbytes = rb;
memcpy(&mqh->mqh_buffer[mqh->mqh_partial_bytes], rawdata,
lengthbytes);
mqh->mqh_partial_bytes += lengthbytes;