From: Nitesh Shetty nj.shetty@samsung.com
[ Upstream commit 20dc66f2d76b4a410df14e4675e373b718babc34 ]
This patch fixes the smatch warning, "nvmet_ns_ana_grpid_store() warn: potential spectre issue 'nvmet_ana_group_enabled' [w] (local cap)" Prevent the contents of kernel memory from being leaked to user space via speculative execution by using array_index_nospec.
Signed-off-by: Nitesh Shetty nj.shetty@samsung.com Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Keith Busch kbusch@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/target/configfs.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c index 907143870da52..01b2a3d1a5e6c 100644 --- a/drivers/nvme/target/configfs.c +++ b/drivers/nvme/target/configfs.c @@ -17,6 +17,7 @@ #endif #include <crypto/hash.h> #include <crypto/kpp.h> +#include <linux/nospec.h>
#include "nvmet.h"
@@ -509,6 +510,7 @@ static ssize_t nvmet_ns_ana_grpid_store(struct config_item *item,
down_write(&nvmet_ana_sem); oldgrpid = ns->anagrpid; + newgrpid = array_index_nospec(newgrpid, NVMET_MAX_ANAGRPS); nvmet_ana_group_enabled[newgrpid]++; ns->anagrpid = newgrpid; nvmet_ana_group_enabled[oldgrpid]--; @@ -1700,6 +1702,7 @@ static struct config_group *nvmet_ana_groups_make_group( grp->grpid = grpid;
down_write(&nvmet_ana_sem); + grpid = array_index_nospec(grpid, NVMET_MAX_ANAGRPS); nvmet_ana_group_enabled[grpid]++; up_write(&nvmet_ana_sem);