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| author | Bart Van Assche <bvanassche@acm.org> | 2020-03-10 05:26:19 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-03-10 14:09:59 +0100 |
| commit | b9853b4d6fb403ccb1d4d82e2d39fc17fc07519c (patch) | |
| tree | 43bb5f7b44fb8a281d9a9d751e9888c78b47e793 /drivers/block/null_blk_main.c | |
| parent | blk-mq: Fix a recently introduced regression in blk_mq_realloc_hw_ctxs() (diff) | |
| download | linux-b9853b4d6fb403ccb1d4d82e2d39fc17fc07519c.tar.xz linux-b9853b4d6fb403ccb1d4d82e2d39fc17fc07519c.zip | |
null_blk: Suppress an UBSAN complaint triggered when setting 'memory_backed'
Although it is not clear to me why UBSAN complains when 'memory_backed'
is set, this patch suppresses the UBSAN complaint that is triggered when
setting that configfs attribute.
UBSAN: Undefined behaviour in drivers/block/null_blk_main.c:327:1
load of value 16 is not a valid value for type '_Bool'
CPU: 2 PID: 8396 Comm: check Not tainted 5.6.0-rc1-dbg+ #14
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
Call Trace:
dump_stack+0xa5/0xe6
ubsan_epilogue+0x9/0x26
__ubsan_handle_load_invalid_value+0x6d/0x76
nullb_device_memory_backed_store.cold+0x2c/0x38 [null_blk]
configfs_write_file+0x1c4/0x250 [configfs]
__vfs_write+0x4c/0x90
vfs_write+0x145/0x2c0
ksys_write+0xd7/0x180
__x64_sys_write+0x47/0x50
do_syscall_64+0x6f/0x2f0
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Cc: Johannes Thumshirn <jth@kernel.org>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
| -rw-r--r-- | drivers/block/null_blk_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c index 133060431dbd..b8a08b82b882 100644 --- a/drivers/block/null_blk_main.c +++ b/drivers/block/null_blk_main.c @@ -276,7 +276,7 @@ nullb_device_##NAME##_store(struct config_item *item, const char *page, \ { \ int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ struct nullb_device *dev = to_nullb_device(item); \ - TYPE uninitialized_var(new_value); \ + TYPE new_value = 0; \ int ret; \ \ ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ |