apply: plug a leak in apply_data

We have an execution path in apply_data that leaks the local struct
image.  Plug it.

This leak can be triggered with:

    $ echo foo >file
    $ git add file && git commit -m file
    $ echo bar >file
    $ git diff file >diff
    $ sed s/foo/frotz/ <diff >baddiff
    $ git apply --cached <baddiff

Fixing this leak allows us to mark as leak-free the following tests:

    + t2016-checkout-patch.sh
    + t4103-apply-binary.sh
    + t4104-apply-boundary.sh
    + t4113-apply-ending.sh
    + t4117-apply-reject.sh
    + t4123-apply-shrink.sh
    + t4252-am-options.sh
    + t4258-am-quoted-cr.sh

Mark them with "TEST_PASSES_SANITIZE_LEAK=true" to notice and fix
promply any new leak that may be introduced and triggered by them in the
future.

Signed-off-by: Rubén Justo <rjusto@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

apply.c

@@ -3712,8 +3712,10 @@ static int apply_data(struct apply_state *state, struct patch *patch,
 			fprintf(stderr, _("Falling back to direct application...\n"));
 
 		/* Note: with --reject, apply_fragments() returns 0 */
-		if (patch->direct_to_threeway || apply_fragments(state, &image, patch) < 0)
+		if (patch->direct_to_threeway || apply_fragments(state, &image, patch) < 0) {
+			clear_image(&image);
 			return -1;
+		}
 	}
 	patch->result = image.buf;
 	patch->resultsize = image.len;

t/t2016-checkout-patch.sh

@@ -2,6 +2,7 @@
 
 test_description='git checkout --patch'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-patch-mode.sh
 
 test_expect_success 'setup' '

t/t4103-apply-binary.sh

@@ -9,6 +9,7 @@ test_description='git apply handling binary patches
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '

t/t4104-apply-boundary.sh

@@ -5,6 +5,7 @@
 
 test_description='git apply boundary tests'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 L="c d e f g h i j k l m n o p q r s t u v w x"

t/t4113-apply-ending.sh

@@ -6,6 +6,7 @@
 test_description='git apply trying to add an ending line.
 
 '
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # setup

t/t4117-apply-reject.sh

@@ -7,6 +7,7 @@ test_description='git apply with rejects
 
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '

t/t4123-apply-shrink.sh

@@ -2,6 +2,7 @@
 
 test_description='apply a patch that is larger than the preimage'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >F  <<\EOF

t/t4252-am-options.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git am with options and not losing them'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 tm="$TEST_DIRECTORY/t4252"

t/t4258-am-quoted-cr.sh

@@ -2,6 +2,7 @@
 
 test_description='test am --quoted-cr=<action>'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 DATA="$TEST_DIRECTORY/t4258"