[PATCH] nvme: check for valid data from from nvme_identify_ns() before using it
Ewan D. Milne
emilne at redhat.com
Fri Nov 10 08:37:21 PST 2023
When scanning namespaces, it is possible to get valid data from the first
call to nvme_identify_ns() in nvme_alloc_ns(), but not from the second
call in nvme_update_ns_info_block(). In particular, if the NSID becomes
inactive between the two commands, a storage device may return a buffer
filled with zero as per 4.1.5.1. In this case, we can get a kernel crash
due to a divide-by-zero in blk_stack_limits() because ns->lba_shift will
be set to zero.
PID: 326 TASK: ffff95fec3cd8000 CPU: 29 COMMAND: "kworker/u98:10"
#0 [ffffad8f8702f9e0] machine_kexec at ffffffff91c76ec7
#1 [ffffad8f8702fa38] __crash_kexec at ffffffff91dea4fa
#2 [ffffad8f8702faf8] crash_kexec at ffffffff91deb788
#3 [ffffad8f8702fb00] oops_end at ffffffff91c2e4bb
#4 [ffffad8f8702fb20] do_trap at ffffffff91c2a4ce
#5 [ffffad8f8702fb70] do_error_trap at ffffffff91c2a595
#6 [ffffad8f8702fbb0] exc_divide_error at ffffffff928506e6
#7 [ffffad8f8702fbd0] asm_exc_divide_error at ffffffff92a00926
[exception RIP: blk_stack_limits+434]
RIP: ffffffff92191872 RSP: ffffad8f8702fc80 RFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff95efa0c91800 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00000000ffffffff R8: ffff95fec7df35a8 R9: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff95fed33c09a8
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#8 [ffffad8f8702fce0] nvme_update_ns_info_block at ffffffffc06d3533 [nvme_core]
#9 [ffffad8f8702fd18] nvme_scan_ns at ffffffffc06d6fa7 [nvme_core]
This happened when the check for valid data was moved out of nvme_identify_ns()
into one of the callers. Fix this by checking in both callers.
Fixes: 0dd6fff2aad4 ("nvme: bring back auto-removal of deleted namespaces during sequential scan")
Cc: stable at vger.kernel.org
Signed-off-by: Ewan D. Milne <emilne at redhat.com>
---
drivers/nvme/host/core.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 88b54cdcbd68..ae35b19cd562 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2027,6 +2027,12 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
if (ret)
return ret;
+ if (id->ncap == 0) {
+ /* namespace not allocated or attached */
+ info->is_removed = true;
+ return -ENODEV;
+ }
+
blk_mq_freeze_queue(ns->disk->queue);
lbaf = nvme_lbaf_index(id->flbas);
ns->lba_shift = id->lbaf[lbaf].ds;
--
2.20.1
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