From: Thomas Gummerer Date: Tue, 8 Oct 2019 17:38:43 +0000 (+0100) Subject: range-diff: don't segfault with mode-only changes X-Git-Tag: v2.24.0-rc0~19^2 X-Git-Url: http://git.ipfire.org/?p=thirdparty%2Fgit.git;a=commitdiff_plain;h=2b6a9b13ca4a687aeb0cad5f32e49711b3e67aaa range-diff: don't segfault with mode-only changes In ef283b3699 ("apply: make parse_git_diff_header public", 2019-07-11) the 'parse_git_diff_header' function was made public and useable by callers outside of apply.c. However it was missed that its (then) only caller, 'find_header' did some error handling, and completing 'struct patch' appropriately. range-diff then started using this function, and tried to handle this appropriately itself, but fell short in some cases. This in turn would lead to range-diff segfaulting when there are mode-only changes in a range. Move the error handling and completing of the struct into the 'parse_git_diff_header' function, so other callers can take advantage of it. This fixes the segfault in 'git range-diff'. Reported-by: Uwe Kleine-König Signed-off-by: Thomas Gummerer Acked-by: Johannes Schindelin Signed-off-by: Junio C Hamano --- diff --git a/apply.c b/apply.c index cde95369bb..5f06a1460c 100644 --- a/apply.c +++ b/apply.c @@ -1361,11 +1361,32 @@ int parse_git_diff_header(struct strbuf *root, if (check_header_line(*linenr, patch)) return -1; if (res > 0) - return offset; + goto done; break; } } +done: + if (!patch->old_name && !patch->new_name) { + if (!patch->def_name) { + error(Q_("git diff header lacks filename information when removing " + "%d leading pathname component (line %d)", + "git diff header lacks filename information when removing " + "%d leading pathname components (line %d)", + parse_hdr_state.p_value), + parse_hdr_state.p_value, *linenr); + return -128; + } + patch->old_name = xstrdup(patch->def_name); + patch->new_name = xstrdup(patch->def_name); + } + if ((!patch->new_name && !patch->is_delete) || + (!patch->old_name && !patch->is_new)) { + error(_("git diff header lacks filename information " + "(line %d)"), *linenr); + return -128; + } + patch->is_toplevel_relative = 1; return offset; } @@ -1546,26 +1567,6 @@ static int find_header(struct apply_state *state, return -128; if (git_hdr_len <= len) continue; - if (!patch->old_name && !patch->new_name) { - if (!patch->def_name) { - error(Q_("git diff header lacks filename information when removing " - "%d leading pathname component (line %d)", - "git diff header lacks filename information when removing " - "%d leading pathname components (line %d)", - state->p_value), - state->p_value, state->linenr); - return -128; - } - patch->old_name = xstrdup(patch->def_name); - patch->new_name = xstrdup(patch->def_name); - } - if ((!patch->new_name && !patch->is_delete) || - (!patch->old_name && !patch->is_new)) { - error(_("git diff header lacks filename information " - "(line %d)"), state->linenr); - return -128; - } - patch->is_toplevel_relative = 1; *hdrsize = git_hdr_len; return offset; } diff --git a/t/t3206-range-diff.sh b/t/t3206-range-diff.sh index ec548654ce..5b87fead2e 100755 --- a/t/t3206-range-diff.sh +++ b/t/t3206-range-diff.sh @@ -226,6 +226,46 @@ test_expect_success 'renamed file' ' test_cmp expected actual ' +test_expect_success 'file with mode only change' ' + git range-diff --no-color --submodule=log topic...mode-only-change >actual && + sed s/Z/\ /g >expected <<-EOF && + 1: fccce22 ! 1: 4d39cb3 s/4/A/ + @@ Metadata + ZAuthor: Thomas Rast + Z + Z ## Commit message ## + - s/4/A/ + + s/4/A/ + add other-file + Z + Z ## file ## + Z@@ + @@ file + Z A + Z 6 + Z 7 + + + + ## other-file (new) ## + 2: 147e64e ! 2: 26c107f s/11/B/ + @@ Metadata + ZAuthor: Thomas Rast + Z + Z ## Commit message ## + - s/11/B/ + + s/11/B/ + mode change other-file + Z + Z ## file ## + Z@@ file: A + @@ file: A + Z 12 + Z 13 + Z 14 + + + + ## other-file (mode change 100644 => 100755) ## + 3: a63e992 = 3: 4c1e0f5 s/12/B/ + EOF + test_cmp expected actual +' + test_expect_success 'file added and later removed' ' git range-diff --no-color --submodule=log topic...added-removed >actual && sed s/Z/\ /g >expected <<-EOF && diff --git a/t/t3206/history.export b/t/t3206/history.export index 7bb3814962..4c808e5b3b 100644 --- a/t/t3206/history.export +++ b/t/t3206/history.export @@ -55,7 +55,7 @@ A 19 20 -commit refs/heads/topic +commit refs/heads/mode-only-change mark :4 author Thomas Rast 1374485014 +0200 committer Thomas Rast 1374485014 +0200 @@ -678,3 +678,32 @@ s/12/B/ from :55 M 100644 :9 renamed-file +commit refs/heads/mode-only-change +mark :57 +author Thomas Rast 1374485024 +0200 +committer Thomas Gummerer 1570473767 +0100 +data 24 +s/4/A/ + add other-file +from :4 +M 100644 :5 file +M 100644 :49 other-file + +commit refs/heads/mode-only-change +mark :58 +author Thomas Rast 1374485036 +0200 +committer Thomas Gummerer 1570473768 +0100 +data 33 +s/11/B/ + mode change other-file +from :57 +M 100644 :7 file +M 100755 :49 other-file + +commit refs/heads/mode-only-change +mark :59 +author Thomas Rast 1374485044 +0200 +committer Thomas Gummerer 1570473768 +0100 +data 8 +s/12/B/ +from :58 +M 100644 :9 file +