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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2022-03-03 18:13:24 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2022-03-03 18:13:24 -0500 |
| commit | 46ab07ffda9d6c8e63360ded2d4568aa160a7700 (patch) | |
| tree | 47b6c1bacd6108ddb279e0ad48edc104716906c0 /src/backend/access/transam/clog.c | |
| parent | 62ce0c758d5d66092efbca7d037233e2ca9bdc78 (diff) | |
| download | postgresql-46ab07ffda9d6c8e63360ded2d4568aa160a7700.tar.gz postgresql-46ab07ffda9d6c8e63360ded2d4568aa160a7700.zip | |
Clean up assorted failures under clang's -fsanitize=undefined checks.
Most of these are cases where we could call memcpy() or other libc
functions with a NULL pointer and a zero count, which is forbidden
by POSIX even though every production version of libc allows it.
We've fixed such things before in a piecemeal way, but apparently
never made an effort to try to get them all. I don't claim that
this patch does so either, but it gets every failure I observe in
check-world, using clang 12.0.1 on current RHEL8.
numeric.c has a different issue that the sanitizer doesn't like:
"ln(-1.0)" will compute log10(0) and then try to assign the
resulting -Inf to an integer variable. We don't actually use the
result in such a case, so there's no live bug.
Back-patch to all supported branches, with the idea that we might
start running a buildfarm member that tests this case. This includes
back-patching c1132aae3 (Check the size in COPY_POINTER_FIELD),
which previously silenced some of these issues in copyfuncs.c.
Discussion: https://postgr.es/m/CALNJ-vT9r0DSsAOw9OXVJFxLENoVS_68kJ5x0p44atoYH+H4dg@mail.gmail.com
Diffstat (limited to 'src/backend/access/transam/clog.c')
| -rw-r--r-- | src/backend/access/transam/clog.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c index de787c3d375..3d9088a7048 100644 --- a/src/backend/access/transam/clog.c +++ b/src/backend/access/transam/clog.c @@ -297,8 +297,9 @@ TransactionIdSetPageStatus(TransactionId xid, int nsubxids, if (all_xact_same_page && xid == MyProc->xid && nsubxids <= THRESHOLD_SUBTRANS_CLOG_OPT && nsubxids == MyProc->subxidStatus.count && - memcmp(subxids, MyProc->subxids.xids, - nsubxids * sizeof(TransactionId)) == 0) + (nsubxids == 0 || + memcmp(subxids, MyProc->subxids.xids, + nsubxids * sizeof(TransactionId)) == 0)) { /* * If we can immediately acquire XactSLRULock, we update the status of |