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authorNiklas Cassel <niklas.cassel@wdc.com>2020-04-27 14:34:41 +0200
committerChristoph Hellwig <hch@lst.de>2020-04-27 17:08:06 +0200
commit132be62387c7a72a38872676c18b0dfae264adb8 (patch)
tree6bc279c67a6338e21deba9bc13f4d6e90bb5ec79 /drivers/nvme
parentd205bde78fa53e1ce256b1f7f65ede9696d73ee5 (diff)
downloadlinux-132be62387c7a72a38872676c18b0dfae264adb8.tar.bz2
nvme: prevent double free in nvme_alloc_ns() error handling
When jumping to the out_put_disk label, we will call put_disk(), which will trigger a call to disk_release(), which calls blk_put_queue(). Later in the cleanup code, we do blk_cleanup_queue(), which will also call blk_put_queue(). Putting the queue twice is incorrect, and will generate a KASAN splat. Set the disk->queue pointer to NULL, before calling put_disk(), so that the first call to blk_put_queue() will not free the queue. The second call to blk_put_queue() uses another pointer to the same queue, so this call will still free the queue. Fixes: 85136c010285 ("lightnvm: simplify geometry enumeration") Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 91c1bd659947..f2adea96b04c 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3642,6 +3642,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
return;
out_put_disk:
+ /* prevent double queue cleanup */
+ ns->disk->queue = NULL;
put_disk(ns->disk);
out_unlink_ns:
mutex_lock(&ctrl->subsys->lock);