[patch 05/21] powerpc: Fix corruption error in rh_alloc_fixed()

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Guillaume Knispel <gknispel@xxxxxxxxxxxxxxxxx>

commit af4d3643864ee5fcba0c97d77a424fa0b0346f8e upstream.

There is an error in rh_alloc_fixed() of the Remote Heap code:
If there is at least one free block blk won't be NULL at the end of the
search loop, so -ENOMEM won't be returned and the else branch of
"if (bs == s || be == e)" will be taken, corrupting the management
structures.

Signed-off-by: Guillaume Knispel <gknispel@xxxxxxxxxxxxxxxxx>
Acked-by: Timur Tabi <timur@xxxxxxxxxxxxx>
Signed-off-by: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/powerpc/lib/rheap.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/lib/rheap.c
+++ b/arch/powerpc/lib/rheap.c
@@ -556,6 +556,7 @@ unsigned long rh_alloc_fixed(rh_info_t *
 		be = blk->start + blk->size;
 		if (s >= bs && e <= be)
 			break;
+		blk = NULL;
 	}
 
 	if (blk == NULL)

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