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XArray: Fix xas_pause for large multi-index entries

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Inspired by the recent Coverity report, I looked for other places where
the offset wasn't being converted to an unsigned long before being
shifted, and I found one in xas_pause() when the entry being paused is
of order >32.

Fixes: b803b42823 ("xarray: Add XArray iterators")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Matthew Wilcox (Oracle) 2020-01-31 06:17:09 -05:00
parent bd40b17ca4
commit c36d451ad3
2 changed files with 38 additions and 1 deletions
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2
lib/xarray.c
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@ -970,7 +970,7 @@ void xas_pause(struct xa_state *xas)
xas->xa_node = XAS_RESTART;
if (node) {
unsigned int offset = xas->xa_offset;
unsigned long offset = xas->xa_offset;
while (++offset < XA_CHUNK_SIZE) {
if (!xa_is_sibling(xa_entry(xas->xa, node, offset)))
break;