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robustness: avoid adding offset to NULL pointer

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UBSAN with clang 10.0 is checking for adding offsets to a `NULL` pointer
which is not allowed. This is not yet checked in the version of clang
used in CI (7.0.0). I will work on cases of this so that tests passes
locally for me.

This could be tested in CI by either upgrading the clang of the
ASAN/UBSAN to 10.0, or add yet another CI target which builds with
clang 10.0.
This commit is contained in:
Björn Linse
2020-08-25 12:40:50 +02:00
parent 7593c8012b
commit b33e375b2b
3 changed files with 4 additions and 3 deletions
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3
src/nvim/fold.c
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@@ -2681,7 +2681,8 @@ static void foldRemove(
fold_changed = true;
continue;
}
if (fp >= (fold_T *)(gap->ga_data) + gap->ga_len
if (gap->ga_data == NULL
|| fp >= (fold_T *)(gap->ga_data) + gap->ga_len
|| fp->fd_top > bot) {
// 6: Found a fold below bot, can stop looking.
break;