ntfs: decompress: remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this moves the stack buffer used during decompression to be allocated externally. The existing "dest_max_index" used in the VLA is bounded by cb_max_page. cb_max_page is bounded by max_page, and max_page is bounded by nr_pages. Since nr_pages is used for the "pages" allocation, it can similarly be used for the "completed_pages" allocation and passed into the decompression function. The error paths are updated to free the new allocation. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com Link: http://lkml.kernel.org/r/20180626172909.41453-3-keescook@chromium.org Signed-off-by:Kees Cook <keescook@chromium.org> Cc: Anton Altaparmakov <anton@tuxera.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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ac4ecf96
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