| commit | 9883c7f84053cec2826ca3c56254601b5ce9cdbe | [log] [tgz] |
|---|---|---|
| author | Jason Gunthorpe <[email protected]> | Mon Jun 19 15:27:25 2023 -0300 |
| committer | Andrew Morton <[email protected]> | Fri Jun 23 16:59:27 2023 -0700 |
| tree | dcdc7f4040b01975d20303c37de21d5be2f66828 | |
| parent | 0b52c420350e8f9873ba62768cd8246827184408 [diff] |
mm/gup: do not return 0 from pin_user_pages_fast() for bad args These routines are not intended to return zero, the callers cannot do anything sane with a 0 return. They should return an error which means future calls to GUP will not succeed, or they should return some non-zero number of pinned pages which means GUP should be called again. If start + nr_pages overflows it should return -EOVERFLOW to signal the arguments are invalid. Syzkaller keeps tripping on this when fuzzing GUP arguments. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Jason Gunthorpe <[email protected]> Reported-by: [email protected] Closes: https://lore.kernel.org/all/[email protected] Reviewed-by: John Hubbard <[email protected]> Reviewed-by: Lorenzo Stoakes <[email protected]> Reviewed-by: David Hildenbrand <[email protected]> Signed-off-by: Andrew Morton <[email protected]>