Commit c2527859 authored by Jeff King's avatar Jeff King Committed by Junio C Hamano

fast-import: fix buffer overflow in dump_tags

When creating a new annotated tag, we sprintf the refname
into a static-sized buffer. If we have an absurdly long
tagname, like:

  git init repo &&
  cd repo &&
  git commit --allow-empty -m foo &&
  git tag -m message mytag &&
  git fast-export mytag |
  perl -lpe '/^tag/ and s/mytag/"a" x 8192/e' |
  git fast-import <input

we'll overflow the buffer. We can fix it by using a strbuf.
Signed-off-by: default avatarJeff King <peff@peff.net>
Reviewed-by: default avatarMichael Haggerty <mhagger@alum.mit.edu>
Reviewed-by: default avatarRonnie Sahlberg <sahlberg@google.com>
Signed-off-by: default avatarJunio C Hamano <gitster@pobox.com>
parent 3c078b9c
......@@ -1730,14 +1730,16 @@ static void dump_tags(void)
static const char *msg = "fast-import";
struct tag *t;
struct ref_lock *lock;
char ref_name[PATH_MAX];
struct strbuf ref_name = STRBUF_INIT;
for (t = first_tag; t; t = t->next_tag) {
sprintf(ref_name, "tags/%s", t->name);
lock = lock_ref_sha1(ref_name, NULL);
strbuf_reset(&ref_name);
strbuf_addf(&ref_name, "tags/%s", t->name);
lock = lock_ref_sha1(ref_name.buf, NULL);
if (!lock || write_ref_sha1(lock, t->sha1, msg) < 0)
failure |= error("Unable to update %s", ref_name);
failure |= error("Unable to update %s", ref_name.buf);
}
strbuf_release(&ref_name);
}
static void dump_marks_helper(FILE *f,
......
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