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apply: don't segfault on binary files with missing data

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Usually when applying a binary diff generated without
--binary, it will be rejected early, as we don't even have
the full sha1 of the pre- and post-images.

However, if the diff is generated with --full-index (but not
--binary), then we will actually try to apply it. If we have
the postimage blob, then we can take a shortcut and never
even look at the binary diff at all (e.g., this can happen
when rebasing changes within a repository).

If we don't have the postimage blob, though, we try to look
at the actual fragments, of which there are none, and get a
segfault. This patch checks explicitly for that case and
complains to the user instead of segfaulting. We need to
keep the check at a low level so that the "shortcut" case
above continues to work.

We also add a test that demonstrates the segfault. While
we're at it, let's also explicitly test the shortcut case.

Reported-by: Rafaël Carré <rafael.carre@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 2010-10-18 14:39:17 -04:00 committed by Junio C Hamano
parent 87b50542a0
commit 24305cd700
2 changed files with 32 additions and 1 deletions
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6
builtin/apply.c
View file

@ -2645,6 +2645,12 @@ static int apply_binary_fragment(struct image *img, struct patch *patch)
unsigned long len;
void *dst;
if (!fragment)
return error("missing binary patch data for '%s'",
patch->new_name ?
patch->new_name :
patch->old_name);
/* Binary patch is irreversible without the optional second hunk */
if (apply_in_reverse) {
if (!fragment->next)

27
t/t4103-apply-binary.sh
View file

@ -37,7 +37,16 @@ test_expect_success 'setup' "
git diff-tree -p -C master binary >C.diff &&
git diff-tree -p --binary master binary >BF.diff &&
git diff-tree -p --binary -C master binary >CF.diff
git diff-tree -p --binary -C master binary >CF.diff &&
git diff-tree -p --full-index master binary >B-index.diff &&
git diff-tree -p -C --full-index master binary >C-index.diff &&
git init other-repo &&
(cd other-repo &&
git fetch .. master &&
git reset --hard FETCH_HEAD
)
"
test_expect_success 'stat binary diff -- should not fail.' \
@ -100,6 +109,22 @@ test_expect_success 'apply binary diff (copy) -- should fail.' \
'do_reset &&
test_must_fail git apply --index C.diff'
test_expect_success 'apply binary diff with full-index' '
do_reset &&
git apply B-index.diff
'
test_expect_success 'apply binary diff with full-index (copy)' '
do_reset &&
git apply C-index.diff
'
test_expect_success 'apply full-index binary diff in new repo' '
(cd other-repo &&
do_reset &&
test_must_fail git apply ../B-index.diff)
'
test_expect_success 'apply binary diff without replacement.' \
'do_reset &&
git apply BF.diff'