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Fix incorrect calculation in shm_mq_receive.

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If some, but not all, of the length word has already been read, and the
next attempt to read sees exactly the number of bytes needed to complete
the length word, or fewer, then we'll incorrectly read less than all of
the available data.

Antonin Houska
This commit is contained in:
Robert Haas 2015-08-06 13:25:45 -04:00
parent 680b82eea8
commit 6d9864d900
1 changed files with 1 additions and 1 deletions
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2
src/backend/storage/ipc/shm_mq.c
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@ -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;