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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/viml/parser/expressions.c
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@@ -1431,7 +1431,7 @@ static inline void east_set_error(const ParserState *const pstate,
const ParserLine pline = pstate->reader.lines.items[start.line];
ret_ast_err->msg = msg;
ret_ast_err->arg_len = (int)(pline.size - start.col);
ret_ast_err->arg = pline.data + start.col;
ret_ast_err->arg = pline.data ? pline.data + start.col : NULL;
}
/// Set error from the given token and given message