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dm: verity-loadpin: Add NULL pointer check for 'bdev' parameter
commit47f04616f2
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>
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@ -58,6 +58,9 @@ bool dm_verity_loadpin_is_bdev_trusted(struct block_device *bdev)
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int srcu_idx;
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int srcu_idx;
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bool trusted = false;
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bool trusted = false;
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if (bdev == NULL)
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return false;
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if (list_empty(&dm_verity_loadpin_trusted_root_digests))
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if (list_empty(&dm_verity_loadpin_trusted_root_digests))
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return false;
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return false;
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