git-core: try_to_follow_renames(): git killed by SIGSEGV

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Hi,

there is a SIGSEGV appearing in Fedora[0] with Git 2.24.1

This bug started to appear after update to Git 2.24.1.
Bug reporter said that Git crashed on him while running VS Code with
Git Lens extension[1]
I have tried to reproduce this bug with my own compiled Git with debug
flags, but sadly SIGSEGV never appeared.

To me it seems like there is a problem in commit a2bb801f6a[2] which
changes move_diff_queue() function. This function calls
diff_tree_oid() that calls try_to_follow_renames(). In the last two
functions there are no arguments checks.

Best regards,
Ondřej Pohořelský

[0] https://retrace.fedoraproject.org/faf/problems/bthash/?bth=25aa7d7267ab5de548ffca337115cb68f7b65105
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1791810
[2] https://git.kernel.org/pub/scm/git/git.git/commit/?id=a2bb801f6a430f6049e5c9729a8f3bf9097d9b34





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