From b928d57ca9aa7457ec0dee022c1664e8cd606b22 Mon Sep 17 00:00:00 2001 From: Kyle Lippincott Date: Mon, 5 Aug 2024 17:10:07 +0000 Subject: set errno=0 before strtoX calls To detect conversion failure after calls to functions like `strtod`, one can check `errno == ERANGE`. These functions are not guaranteed to set `errno` to `0` on successful conversion, however. Manual manipulation of `errno` can likely be avoided by checking that the output pointer differs from the input pointer, but that's not how other locations, such as parse.c:139, handle this issue; they set errno to 0 prior to executing the function. For every place I could find a strtoX function with an ERANGE check following it, set `errno = 0;` prior to executing the conversion function. Signed-off-by: Kyle Lippincott Signed-off-by: Junio C Hamano --- builtin/get-tar-commit-id.c | 1 + 1 file changed, 1 insertion(+) (limited to 'builtin') diff --git a/builtin/get-tar-commit-id.c b/builtin/get-tar-commit-id.c index 66a7389f9f..7195a072ed 100644 --- a/builtin/get-tar-commit-id.c +++ b/builtin/get-tar-commit-id.c @@ -35,6 +35,7 @@ int cmd_get_tar_commit_id(int argc, const char **argv UNUSED, const char *prefix if (header->typeflag[0] != TYPEFLAG_GLOBAL_HEADER) return 1; + errno = 0; len = strtol(content, &end, 10); if (errno == ERANGE || end == content || len < 0) return 1; -- cgit v1.3-5-g45d5