[PATCH v3 1/2] reftable/writer: fix memory leak when `padded_write()` fails

["Lidong Yan via GitGitGadget" <gitgitgadget@gmail.com>]

From: Lidong Yan <502024330056@smail.nju.edu.cn>

In reftable/writer.c:padded_write(), if w->writer failed, zeroed
allocated in `reftable_calloc` will leak. w->writer could be
`reftable_write_data` in reftable/stack.c, and could fail due to
some write error. Simply add reftable_free(zeroed) will solve this
problem.

Signed-off-by: Lidong Yan <502024330056@smail.nju.edu.cn>
---
 reftable/writer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/reftable/writer.c b/reftable/writer.c
index cb16f71be49e..3ceb37428887 100644
--- a/reftable/writer.c
+++ b/reftable/writer.c
@@ -57,8 +57,10 @@ static int padded_write(struct reftable_writer *w, uint8_t *data, size_t len,
 			return -1;
 
 		n = w->write(w->write_arg, zeroed, w->pending_padding);
-		if (n < 0)
+		if (n < 0) {
+			reftable_free(zeroed);
 			return n;
+		}
 
 		w->pending_padding = 0;
 		reftable_free(zeroed);
-- 
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