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SUNRPC: _shift_data_left/right_pages should check the shift length 

Exit early if the shift is zero.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-12-07 13:30:46 -05:00
parent 1f70ea7009
commit c54e959b36
1 changed files with 12 additions and 0 deletions
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12
net/sunrpc/xdr.c
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@ -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;