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dm: verity-loadpin: Add NULL pointer check for 'bdev' parameter 

commit 47f04616f2 upstream.

Add a NULL check for the 'bdev' parameter of
dm_verity_loadpin_is_bdev_trusted(). The function is called
by loadpin_check(), which passes the block device that
corresponds to the super block of the file system from which
a file is being loaded. Generally a super_block structure has
an associated block device, however that is not always the
case (e.g. tmpfs).

Cc: stable@vger.kernel.org # v6.0+
Fixes: b6c1c5745c ("dm: Add verity helpers for LoadPin")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20230627202800.1.Id63f7f59536d20f1ab83e1abdc1fda1471c7d031@changeid
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthias Kaehlcke 2023-06-27 20:28:01 +00:00 committed by Greg Kroah-Hartman
parent 08aaeda414
commit 0a1dc6377a
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm-verity-loadpin.c
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@ -58,6 +58,9 @@ bool dm_verity_loadpin_is_bdev_trusted(struct block_device *bdev)
int srcu_idx;
bool trusted = false;
if (bdev == NULL)
return false;
if (list_empty(&dm_verity_loadpin_trusted_root_digests))
return false;