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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 | b0bc196e52e606fe0116fb63da20f57fb577745b (patch) | |
| tree | 99436db14ec4c33b4953df3fb3a1761cfe75107e /src/fe_utils/print.c | |
| parent | 2a1f84636dc335a3edf53a8361ae44bb2ae00093 (diff) | |
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/fe_utils/print.c')
| -rw-r--r-- | src/fe_utils/print.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/fe_utils/print.c b/src/fe_utils/print.c index d48fcc4a032..2d0f78b8a2d 100644 --- a/src/fe_utils/print.c +++ b/src/fe_utils/print.c @@ -896,7 +896,8 @@ print_aligned_text(const printTableContent *cont, FILE *fout, bool is_pager) more_col_wrapping = col_count; curr_nl_line = 0; - memset(header_done, false, col_count * sizeof(bool)); + if (col_count > 0) + memset(header_done, false, col_count * sizeof(bool)); while (more_col_wrapping) { if (opt_border == 2) |