[PATCH 3/3] xdiff: handle allocation failure when merging

["Phillip Wood via GitGitGadget" <gitgitgadget@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

Other users of xdiff such as libgit2 need to be able to handle
allocation failures. These allocation failures were previously
ignored.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 xdiff/xmerge.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index 48c5e9e3f35..b9d72f0e9f8 100644
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -711,10 +711,18 @@ int xdl_merge(mmfile_t *orig, mmfile_t *mf1, mmfile_t *mf2,
 	status = 0;
 	if (!xscr1) {
 		result->ptr = xdl_malloc(mf2->size);
+		if (!result->ptr) {
+			status = -1;
+			goto out;
+		}
 		memcpy(result->ptr, mf2->ptr, mf2->size);
 		result->size = mf2->size;
 	} else if (!xscr2) {
 		result->ptr = xdl_malloc(mf1->size);
+		if (!result->ptr) {
+			status = -1;
+			goto out;
+		}
 		memcpy(result->ptr, mf1->ptr, mf1->size);
 		result->size = mf1->size;
 	} else {
-- 
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