[PATCH v2 08/11] reftable/writer: unify releasing memory

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



There are two code paths which release memory of the reftable writer:

  - `reftable_writer_close()` releases internal state after it has
    written data.

  - `reftable_writer_free()` releases the block that was written to and
    the writer itself.

Both code paths free different parts of the writer, and consequently the
caller must make sure to call both. And while callers mostly do this
already, this falls apart when a write failure causes the caller to skip
calling `reftable_write_close()`.

Introduce a new function `reftable_writer_release()` that releases all
internal state and call it from both paths. Like this it is fine for the
caller to not call `reftable_writer_close()`.

Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
 reftable/writer.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/reftable/writer.c b/reftable/writer.c
index d347ec4cc6..7b70c9b666 100644
--- a/reftable/writer.c
+++ b/reftable/writer.c
@@ -149,11 +149,21 @@ void reftable_writer_set_limits(struct reftable_writer *w, uint64_t min,
 	w->max_update_index = max;
 }
 
+static void reftable_writer_release(struct reftable_writer *w)
+{
+	if (w) {
+		reftable_free(w->block);
+		w->block = NULL;
+		block_writer_release(&w->block_writer_data);
+		w->block_writer = NULL;
+		writer_clear_index(w);
+		strbuf_release(&w->last_key);
+	}
+}
+
 void reftable_writer_free(struct reftable_writer *w)
 {
-	if (!w)
-		return;
-	reftable_free(w->block);
+	reftable_writer_release(w);
 	reftable_free(w);
 }
 
@@ -643,16 +653,13 @@ int reftable_writer_close(struct reftable_writer *w)
 	}
 
 done:
-	/* free up memory. */
-	block_writer_release(&w->block_writer_data);
-	writer_clear_index(w);
-	strbuf_release(&w->last_key);
+	reftable_writer_release(w);
 	return err;
 }
 
 static void writer_clear_index(struct reftable_writer *w)
 {
-	for (size_t i = 0; i < w->index_len; i++)
+	for (size_t i = 0; w->index && i < w->index_len; i++)
 		strbuf_release(&w->index[i].last_key);
 	FREE_AND_NULL(w->index);
 	w->index_len = 0;
-- 
2.44.GIT

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Linux Kernel Development]     [Gcc Help]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [V4L]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]     [Fedora Users]

  Powered by Linux