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diff-lib: ignore paths that are outside $cwd if --relative asked

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For diff family commands, we can tell them to exclude changes outside
of some directories if --relative is requested.

In diff_unmerge(), NULL will be returned if the requested path is
outside of the interesting directories, thus we'll run into NULL
pointer dereference in run_diff_files when trying to dereference
its return value.

Checking for return value of diff_unmerge before dereferencing
is not sufficient, though. Since, diff engine will try to work on such
pathspec later.

Let's not run diff on those unintesting entries, instead.
As a side effect, by skipping like that, we can save some CPU cycles.

Reported-by: Thomas De Zeeuw <thomas@slight.dev>
Tested-by: Carlo Arenas <carenas@gmail.com>
Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Đoàn Trần Công Danh 2021-08-22 15:49:08 +07:00 committed by Junio C Hamano
parent 94f6e3e283
commit 8174627b3d
2 changed files with 57 additions and 0 deletions
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4
diff-lib.c
View File

@ -116,6 +116,10 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
if (!ce_path_match(istate, ce, &revs->prune_data, NULL))
continue;
if (revs->diffopt.prefix &&
strncmp(ce->name, revs->diffopt.prefix, revs->diffopt.prefix_length))
continue;
if (ce_stage(ce)) {
struct combine_diff_path *dpath;
struct diff_filepair *pair;

53
t/t4045-diff-relative.sh
View File

@ -162,4 +162,57 @@ check_diff_relative_option subdir file2 true --no-relative --relative
check_diff_relative_option . file2 false --no-relative --relative=subdir
check_diff_relative_option . file2 true --no-relative --relative=subdir
test_expect_success 'setup diff --relative unmerged' '
test_commit zero file0 &&
test_commit base subdir/file0 &&
git switch -c br1 &&
test_commit one file0 &&
test_commit sub1 subdir/file0 &&
git switch -c br2 base &&
test_commit two file0 &&
git switch -c br3 &&
test_commit sub3 subdir/file0
'
test_expect_success 'diff --relative without change in subdir' '
git switch br2 &&
test_when_finished "git merge --abort" &&
test_must_fail git merge one &&
git -C subdir diff --relative >out &&
test_must_be_empty out &&
git -C subdir diff --relative --name-only >out &&
test_must_be_empty out
'
test_expect_success 'diff --relative --name-only with change in subdir' '
git switch br3 &&
test_when_finished "git merge --abort" &&
test_must_fail git merge sub1 &&
test_write_lines file0 file0 >expected &&
git -C subdir diff --relative --name-only >out &&
test_cmp expected out
'
test_expect_failure 'diff --relative with change in subdir' '
git switch br3 &&
br1_blob=$(git rev-parse --short --verify br1:subdir/file0) &&
br3_blob=$(git rev-parse --short --verify br3:subdir/file0) &&
test_when_finished "git merge --abort" &&
test_must_fail git merge br1 &&
cat >expected <<-EOF &&
diff --cc file0
index $br3_blob,$br1_blob..0000000
--- a/file0
+++ b/file0
@@@ -1,1 -1,1 +1,5 @@@
++<<<<<<< HEAD
+sub3
++=======
+ sub1
++>>>>>>> br1
EOF
git -C subdir diff --relative >out &&
test_cmp expected out
'
test_done