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-rw-r--r--editors/patch.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/editors/patch.c b/editors/patch.c
index 13785ef46..f86067544 100644
--- a/editors/patch.c
+++ b/editors/patch.c
@@ -345,6 +345,8 @@ done:
// state 1: Found +++ file indicator, look for @@
// state 2: In hunk: counting initial context lines
// state 3: In hunk: getting body
+// Like GNU patch, we don't require a --- line before the +++, and
+// also allow the --- after the +++ line.
int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int patch_main(int argc UNUSED_PARAM, char **argv)
@@ -462,6 +464,14 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
TT.context = 0;
state = 2;
+ // If the --- line is missing or malformed, either oldname
+ // or (for -R) newname could be NULL -- but not both. Like
+ // GNU patch, proceed based on the +++ line, and avoid SEGVs.
+ if (!oldname)
+ oldname = xstrdup("MISSING_FILENAME");
+ if (!newname)
+ newname = xstrdup("MISSING_FILENAME");
+
// If this is the first hunk, open the file.
if (TT.filein == -1) {
int oldsum, newsum, empty = 0;