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[05/17] btrfs-progs: avoid double-free in __btrfs_map_block

Message ID 1361832890-40921-6-git-send-email-sandeen@redhat.com (mailing list archive)
State Under Review, archived
Headers show

Commit Message

Eric Sandeen Feb. 25, 2013, 10:54 p.m. UTC
__btrfs_map_block() can possibly do the goto again: loop after
having allocated & freed the "multi" pointer.  There are then
a couple error conditions where it will attempt to again kfree
the now non-NULL multi pointer.  So before retrying, reset
multi to NULL after we free it.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
 volumes.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
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Patch

diff --git a/volumes.c b/volumes.c
index c8fbde3..ca1b402 100644
--- a/volumes.c
+++ b/volumes.c
@@ -1226,6 +1226,7 @@  again:
 	if (multi_ret && stripes_allocated < stripes_required) {
 		stripes_allocated = stripes_required;
 		kfree(multi);
+		multi = NULL;
 		goto again;
 	}
 	stripe_nr = offset;