Commit c54e959b authored by Trond Myklebust's avatar Trond Myklebust
Browse files

SUNRPC: _shift_data_left/right_pages should check the shift length 



Exit early if the shift is zero.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 1f70ea70

net/sunrpc/xdr.c

+12 −0
Original line number Diff line number Diff line
@@ -225,6 +225,9 @@ _shift_data_left_pages(struct page **pages, size_t pgto_base, 


	BUG_ON(pgfrom_base <= pgto_base);



	if (!len)

		return;



	pgto = pages + (pgto_base >> PAGE_SHIFT);

	pgfrom = pages + (pgfrom_base >> PAGE_SHIFT);
@@ -307,6 +310,9 @@ _shift_data_right_pages(struct page **pages, size_t pgto_base, 


	BUG_ON(pgto_base <= pgfrom_base);



	if (!len)

		return;



	pgto_base += len;

	pgfrom_base += len;
@@ -405,6 +411,9 @@ _copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len) 
	char *vto;

	size_t copy;



	if (!len)

		return;



	pgto = pages + (pgbase >> PAGE_SHIFT);

	pgbase &= ~PAGE_MASK;
@@ -449,6 +458,9 @@ _copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len) 
	char *vfrom;

	size_t copy;



	if (!len)

		return;



	pgfrom = pages + (pgbase >> PAGE_SHIFT);

	pgbase &= ~PAGE_MASK;