From: Junio C Hamano <junkio@cox.net>
Date: Mon, 13 Jun 2005 00:23:15 +0000 (-0700)
Subject: [PATCH] Re-Fix SIGSEGV on unmerged files in git-diff-files -p
X-Git-Tag: v0.99~292
X-Git-Url: https://git.octo.it/?a=commitdiff_plain;h=dc7090efbc8280e482a6b2dc7419e525cbc3c5d7;p=git.git

[PATCH] Re-Fix SIGSEGV on unmerged files in git-diff-files -p

When an unmerged path was fed via diff_unmerged() into diffcore,
it eventually called run_diff() with "one" and "two" parameters
with NULL, but run_diff() was not written carefully enough to
notice this situation.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/diff.c b/diff.c
index 046d9a39..dd1c0b6d 100644
--- a/diff.c
+++ b/diff.c
@@ -555,6 +555,7 @@ static void run_diff(const char *name,
 {
 	const char *pgm = external_diff();
 	if (!pgm &&
+	    one && two &&
 	    DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
 	    (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
 		/* a filepair that changes between file and symlink
diff --git a/diffcore.h b/diffcore.h
index ac159d71..f1b5ca74 100644
--- a/diffcore.h
+++ b/diffcore.h
@@ -33,7 +33,7 @@ struct diff_filespec {
 				  * if false, use the name and read from
 				  * the filesystem.
 				  */
-#define DIFF_FILE_VALID(spec) ((spec) && ((spec)->mode) != 0)
+#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
 	unsigned should_free : 1; /* data should be free()'ed */
 	unsigned should_munmap : 1; /* data should be munmap()'ed */
 };