Linus Torvalds  committed 6b1f8c3

"git fmt-merge-msg" SIGSEGV

Ok, this is a _really_ stupid case, and I don't think it matters, but hey,
we should never SIGSEGV.

Steps to reproduce:

mkdir duh
cd duh
git init-db
git-fmt-merge-msg < /dev/null

will cause a SIGSEGV in cmd_fmt_merge_msg(), because we're doing a
strncmp() with a NULL current_branch.

And yeah, it's an insane schenario, and no, it doesn't really matter. The
only reason I noticed was that a broken version of my "git pull" into an
empty directory would cause this.

This silly patch just replaces the SIGSEGV with a controlled exit with an
error message.

Signed-off-by: Linus Torvalds <>
Signed-off-by: Junio C Hamano <>

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File builtin-fmt-merge-msg.c

 	/* get current branch */
 	current_branch = resolve_ref("HEAD", head_sha1, 1, NULL);
+	if (!current_branch)
+		die("No current branch");
 	if (!strncmp(current_branch, "refs/heads/", 11))
 		current_branch += 11;