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sequencer: detect author name errors in read_author_script()

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As we parse the author-script file, we check for missing or duplicate
lines for GIT_AUTHOR_NAME, etc. But after reading the whole file, our
final error conditional checks "date_i" twice and "name_i" not at all.
This not only leads to us failing to abort, but we may do an
out-of-bounds read on the string_list array.

The bug goes back to 442c36bd08 (am: improve author-script error
reporting, 2018-10-31), though the code was soon after moved to this
spot by bcd33ec25f (add read_author_script() to libgit, 2018-10-31).
It was presumably just a typo in 442c36bd08.

We'll add test coverage for all the error cases here, though only the
GIT_AUTHOR_NAME ones fail (even in a vanilla build they segfault
consistently, but certainly with SANITIZE=address).

Reported-by: Michael V. Scovetta <michael.scovetta@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2022-10-03 13:35:02 -04:00 committed by Junio C Hamano
parent 359da658ae
commit 45350aeb11
2 changed files with 60 additions and 1 deletions
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2
sequencer.c
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@ -872,7 +872,7 @@ int read_author_script(const char *path, char **name, char **email, char **date,
error(_("missing 'GIT_AUTHOR_EMAIL'"));
if (date_i == -2)
error(_("missing 'GIT_AUTHOR_DATE'"));
if (date_i < 0 || email_i < 0 || date_i < 0 || err)
if (name_i < 0 || email_i < 0 || date_i < 0 || err)
goto finish;
*name = kv.items[name_i].util;
*email = kv.items[email_i].util;

59
t/t3438-rebase-broken-files.sh Executable file
View File

@ -0,0 +1,59 @@
#!/bin/sh
test_description='rebase behavior when on-disk files are broken'
. ./test-lib.sh
test_expect_success 'set up conflicting branches' '
test_commit base file &&
git checkout -b branch1 &&
test_commit one file &&
git checkout -b branch2 HEAD^ &&
test_commit two file
'
create_conflict () {
test_when_finished "git rebase --abort" &&
git checkout -B tmp branch2 &&
test_must_fail git rebase branch1
}
check_resolve_fails () {
echo resolved >file &&
git add file &&
test_must_fail git rebase --continue
}
for item in NAME EMAIL DATE
do
test_expect_success "detect missing GIT_AUTHOR_$item" '
create_conflict &&
grep -v $item .git/rebase-merge/author-script >tmp &&
mv tmp .git/rebase-merge/author-script &&
check_resolve_fails
'
done
for item in NAME EMAIL DATE
do
test_expect_success "detect duplicate GIT_AUTHOR_$item" '
create_conflict &&
grep -i $item .git/rebase-merge/author-script >tmp &&
cat tmp >>.git/rebase-merge/author-script &&
check_resolve_fails
'
done
test_expect_success 'unknown key in author-script' '
create_conflict &&
echo "GIT_AUTHOR_BOGUS=${SQ}whatever${SQ}" \
>>.git/rebase-merge/author-script &&
check_resolve_fails
'
test_done