diff options
| 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 | f727b6ea8f3b42496e21361ddc1af9d7e12582ad (patch) | |
| tree | 927ccb3b3ffc8a63fe63ef35c1a7b030c041222e /src/backend/access/heap/heapam.c | |
| parent | 72918ea86cb9308dd4748b4e269e3a53917cbdca (diff) | |
| download | postgresql-f727b6ea8f3b42496e21361ddc1af9d7e12582ad.tar.gz postgresql-f727b6ea8f3b42496e21361ddc1af9d7e12582ad.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/heap/heapam.c')
| -rw-r--r-- | src/backend/access/heap/heapam.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c index 1107102fcdb..839d2ceec71 100644 --- a/src/backend/access/heap/heapam.c +++ b/src/backend/access/heap/heapam.c @@ -309,7 +309,7 @@ initscan(HeapScanDesc scan, ScanKey key, bool keep_startblock) /* * copy the scan key, if appropriate */ - if (key != NULL) + if (key != NULL && scan->rs_base.rs_nkeys > 0) memcpy(scan->rs_base.rs_key, key, scan->rs_base.rs_nkeys * sizeof(ScanKeyData)); /* |