[PATCH 4.19 018/125] scsi: target: tcmu: Fix crash on ARM during cmd completion

Greg Kroah-Hartman
2020-09-01T15:24:31Z

From: Bodo Stroesser <bstroesser@ts.fujitsu.com>

[ Upstream commit 5a0c256d96f020e4771f6fd5524b80f89a2d3132 ]

If tcmu_handle_completions() has to process a padding shorter than
sizeof(struct tcmu_cmd_entry), the current call to
tcmu_flush_dcache_range() with sizeof(struct tcmu_cmd_entry) as length
param is wrong and causes crashes on e.g. ARM, because
tcmu_flush_dcache_range() in this case calls
flush_dcache_page(vmalloc_to_page(start)); with start being an invalid
address above the end of the vmalloc'ed area.

The fix is to use the minimum of remaining ring space and sizeof(struct
tcmu_cmd_entry) as the length param.

The patch was tested on kernel 4.19.118.

See https://bugzilla.kernel.org/show_bug.cgi?id=208045#c10

Link: https://lore.kernel.org/r/20200629093756.8947-1-bstroesser@ts.fujitsu.com
Tested-by: JiangYu <lnsyyj@hotmail.com>
Acked-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/target/target_core_user.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 9c05e820857aa..91dbac7446a47 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1231,7 +1231,14 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)

struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned;

- tcmu_flush_dcache_range(entry, sizeof(*entry));
+ /*
+ * Flush max. up to end of cmd ring since current entry might
+ * be a padding that is shorter than sizeof(*entry)
+ */
+ size_t ring_left = head_to_end(udev->cmdr_last_cleaned,
+ udev->cmdr_size);
+ tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ?
+ ring_left : sizeof(*entry));

if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) {
UPDATE_HEAD(udev->cmdr_last_cleaned,
--
2.25.1