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Fix incorrect initialization of BackendActivityBuffer.

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Since commit c8e8b5a6e, this has been zeroed out using the wrong length.
In practice the length would always be too small, leading to not zeroing
the whole buffer rather than clobbering additional memory; and that's
pretty harmless, both because shmem would likely start out as zeroes
and because we'd reinitialize any given entry before use.  Still,
it's bogus, so fix it.

Reported by Petru-Florin Mihancea (bug #15312)

Discussion: https://postgr.es/m/153363913073.1303.6518849192351268091@wrigleys.postgresql.org
This commit is contained in:
Tom Lane 2018-08-07 16:00:44 -04:00
parent 187331fefd
commit 1b5438ec2a
1 changed files with 1 additions and 1 deletions
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2
src/backend/postmaster/pgstat.c
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@ -2695,7 +2695,7 @@ CreateSharedBackendStatus(void)
if (!found) if (!found)
{ {
MemSet(BackendActivityBuffer, 0, size); MemSet(BackendActivityBuffer, 0, BackendActivityBufferSize);
/* Initialize st_activity pointers. */ /* Initialize st_activity pointers. */
buffer = BackendActivityBuffer; buffer = BackendActivityBuffer;