Re: [PATCH] xdiff/xmerge: fix memory leak in xdl_merge

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Hi Patrick,

On Tue, 23 Feb 2016, Patrick Steinhardt wrote:

> When building the script for the second file that is to be merged
> we have already allocated memory for data structures related to
> the first file. When we encounter an error in building the second
> script we only free allocated memory related to the second file
> before erroring out.

ACK.

I wonder, though, whether we need this in addition:

-- snipsnap --
t a/xdiff/xmerge.c b/xdiff/xmerge.c
index 625198e..e5c8745 100644
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -579,8 +579,11 @@ int xdl_merge(mmfile_t *orig, mmfile_t *mf1, mmfile_t
*mf2,
 	result->ptr = NULL;
 	result->size = 0;
 
-	if (xdl_do_diff(orig, mf1, xpp, &xe1) < 0 ||
-			xdl_do_diff(orig, mf2, xpp, &xe2) < 0) {
+	if (xdl_do_diff(orig, mf1, xpp, &xe1) < 0) {
+		return -1;
+	}
+	if (xdl_do_diff(orig, mf2, xpp, &xe2) < 0) {
+		xdl_free_env(&xe1);
 		return -1;
 	}
 	if (xdl_change_compact(&xe1.xdf1, &xe1.xdf2, xpp->flags) < 0 ||

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