John Poduska 73c383f541 Prevent incorrect datasets being mounted ... During a mount, zpl_mount_impl(), uses sget() with the callback zpl_test_super() to find a super_block with a matching objset, stored in z_os. It does so without taking the teardown lock on the zfsvfs. The problem is that operations like rollback will replace the z_os. And, there is a window where the objset in the rollback is freed, but z_os still points to it. Then, a mount like operation, for instance a clone, can reallocate that exact same pointer and zpl_test_super() will then match the super_block associated with the rollback as opposed to the clone. This fix tests for a match and if so, takes the teardown lock before doing the final match test. Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: John Poduska <jpoduska@datto.com> Closes #14518		2023-02-27 16:49:34 -08:00
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spl	Cleanup of dead code suggested by Clang Static Analyzer (#14380)	2023-01-17 09:57:12 -08:00
zfs	Prevent incorrect datasets being mounted	2023-02-27 16:49:34 -08:00