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tree-walk: use size_t consistently

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We store and manipulate the cumulative traverse_info.pathlen as an
"int", which can overflow when we are fed ridiculously long pathnames
(e.g., ones at the edge of 2GB or 4GB, even if the individual tree entry
names are smaller than that). The results can be confusing, though
after some prodding I was not able to use this integer overflow to cause
an under-allocated buffer.

Let's consistently use size_t to generate and store these, and make
sure our addition doesn't overflow.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2019-07-31 00:38:18 -04:00
committed by Junio C Hamano
parent 9055384710
commit 37806080d7
3 changed files with 8 additions and 8 deletions
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4
tree-walk.c
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@@ -168,7 +168,7 @@ int tree_entry_gently(struct tree_desc *desc, struct name_entry *entry)
void setup_traverse_info(struct traverse_info *info, const char *base)
{
int pathlen = strlen(base);
size_t pathlen = strlen(base);
static struct traverse_info dummy;
memset(info, 0, sizeof(*info));
@@ -184,7 +184,7 @@ void setup_traverse_info(struct traverse_info *info, const char *base)
char *make_traverse_path(char *path, const struct traverse_info *info,
const char *name, size_t namelen)
{
int pathlen = info->pathlen;
size_t pathlen = info->pathlen;
path[pathlen + namelen] = 0;
for (;;) {