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author | Mike Snitzer <snitzer@kernel.org> | 2022-04-13 18:06:19 +0300 |
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committer | Mike Snitzer <snitzer@kernel.org> | 2022-04-13 20:22:17 +0300 |
commit | 73d7b06e902dd294e1f61554f7c403d0f705cf92 (patch) | |
tree | 3d9e26fff2473ffffa6afad5064ec74f0fc4cb74 /drivers/hwmon/fschmd.c | |
parent | ce40426fdc3c92acdba6b5ca74bc7277ffaa6a3d (diff) | |
download | linux-73d7b06e902dd294e1f61554f7c403d0f705cf92.tar.xz |
dm zone: fix NULL pointer dereference in dm_zone_map_bio
Commit 0fbb4d93b38b ("dm: add dm_submit_bio_remap interface") changed
the alloc_io() function to delay the initialization of struct dm_io's
orig_bio member, leaving it NULL until after the dm_io and associated
user submitted bio is processed by __split_and_process_bio(). This
change causes a NULL pointer dereference in dm_zone_map_bio() when the
original user bio is inspected to detect the need for zone append
command emulation.
Fix this NULL pointer by updating dm_zone_map_bio() to not access
->orig_bio when the same info can be accessed from the clone of the
->orig_bio _before_ any ->map processing. Save off the bio_op() and
bio_sectors() for the clone and then use the saved orig_bio_details as
needed.
Fixes: 0fbb4d93b38b ("dm: add dm_submit_bio_remap interface")
Reported-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/hwmon/fschmd.c')
0 files changed, 0 insertions, 0 deletions