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24797a3442
nes_reg_user_mr() should fail if page_count becomes >= 1024 * 512 rather than just testing for strict >, because page_count is essentially used as an index into an array with 1024 * 512 entries, so allowing the loop to continue with page_count == 1024 * 512 means that memory after the end of the array is corrupted. This leads to a crash triggerable by a userspace application that requests registration of a too-big region. Also get rid of the call to pci_free_consistent() here to avoid corrupting state with a double free, since the same memory will be freed in the code jumped to at reg_user_mr_err. Signed-off-by: Roland Dreier <rolandd@cisco.com> |
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