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| author | Keith Busch <keith.busch@intel.com> | 2014-04-25 02:53:50 +0200 |
|---|---|---|
| committer | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2014-05-05 16:41:25 +0200 |
| commit | 94bbac4052eb93219ca0aa370ca741486b25fb98 (patch) | |
| tree | ab2d9e4f3a69c4f751d661b7c76f751f4b6fa9c0 /drivers/block/nvme-core.c | |
| parent | NVMe: Improve error messages (diff) | |
| download | linux-94bbac4052eb93219ca0aa370ca741486b25fb98.tar.xz linux-94bbac4052eb93219ca0aa370ca741486b25fb98.zip | |
NVMe: Protect against badly formatted CQEs
If a misbehaving device posts a CQE with a command id < depth but for
one that was never allocated, the command info will have a callback
function set to NULL and we don't want to try invoking that.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Diffstat (limited to 'drivers/block/nvme-core.c')
| -rw-r--r-- | drivers/block/nvme-core.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index 074e9829bb08..b9f07f81ea5d 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -243,8 +243,9 @@ static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid, void *ctx; struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); - if (cmdid >= nvmeq->q_depth) { - *fn = special_completion; + if (cmdid >= nvmeq->q_depth || !info[cmdid].fn) { + if (fn) + *fn = special_completion; return CMD_CTX_INVALID; } if (fn) |