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| author |  Jeff King <peff@peff.net> | 2017-09-27 02:00:28 -0400 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2017-09-27 15:45:24 +0900 |
| commit | 61d36330b422237b6be9581cdbade07782ab61a8 (patch) | |
| tree | 3992d5a85c03b6d88924c10f7a79b252e44c36be /builtin | |
| parent | notes-merge: drop dead zero-write code (diff) | |
| download | tgif-61d36330b422237b6be9581cdbade07782ab61a8.tar.xz | |
prefer "!=" when checking read_in_full() result
Comparing the result of read_in_full() using less-than is
potentially dangerous, as a negative return value may be
converted to an unsigned type and be considered a success.
This is discussed further in 561598cfcf (read_pack_header:
handle signed/unsigned comparison in read result,
2017-09-13).
Each of these instances is actually fine in practice:
- in get-tar-commit-id, the HEADERSIZE macro expands to a
signed integer. If it were switched to an unsigned type
(e.g., a size_t), then it would be a bug.
- the other two callers check for a short read only after
handling a negative return separately. This is a fine
practice, but we'd prefer to model "!=" as a general
rule.
So all of these cases can be considered cleanups and not
actual bugfixes.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin')
| -rw-r--r-- | builtin/get-tar-commit-id.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin/get-tar-commit-id.c b/builtin/get-tar-commit-id.c index 6d9a79f9b3..cd3e656828 100644 --- a/builtin/get-tar-commit-id.c +++ b/builtin/get-tar-commit-id.c @@ -26,7 +26,7 @@ int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix) usage(builtin_get_tar_commit_id_usage); n = read_in_full(0, buffer, HEADERSIZE); - if (n < HEADERSIZE) + if (n != HEADERSIZE) die("git get-tar-commit-id: read error"); if (header->typeflag[0] != 'g') return 1; |