From: Tribo Dar <3bodar@gmail.com>
Date: Wed, 24 May 2023 06:59:55 GMT
Subject: [BUG] Segmentation fault in git v2.41.0.rc1
Message-ID: <CACJVABb8tvgXAowgtHLrC6Uau8Q03VRFu1m7K91SJwjvufqXYw@mail.gmail.com>

Running `git submodule update` after commenting out the url setting in both
.gitmodules and the corresponding section for the submodule in .git/config
results in a segmentation fault instead of a suitable error message.

The cause is `sub->url` being NULL here (actual segfault
comes a couple calls further):
https://github.com/git/git/blob/9e49351c3060e1fa6e0d2de64505b7becf157f28/builtin/submodule--helper.c#L2027

Possibly relevant: a similar snippet is being properly protected against
null-pointer dereferencing here:
https://github.com/git/git/blob/9e49351c3060e1fa6e0d2de64505b7becf157f28/builtin/submodule--helper.c#L1243