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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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2
src/nvim/eval/decode.c
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@@ -586,7 +586,7 @@ parse_json_number_check:
if (p == ints) {
emsgf(_("E474: Missing number after minus sign: %.*s"), LENP(s, e));
goto parse_json_number_fail;
} else if (p == fracs || exps_s == fracs + 1) {
} else if (p == fracs || (fracs != NULL && exps_s == fracs + 1)) {
emsgf(_("E474: Missing number after decimal dot: %.*s"), LENP(s, e));
goto parse_json_number_fail;
} else if (p == exps) {