In case of VM_FAULT_RETRY, __get_user_pages returns the number
of pages alredy gotten, but there isn't a check if this number is
zero. Instead, we have to return a proper error code so we can avoid
a possible extra call of __get_user_pages. There are several
places where get_user_pages is called inside a loop until all the
pages requested are gotten or an error code is returned.
Signed-off-by: Marco Stornelli <marco.stornelli@xxxxxxxxx>
---
mm/memory.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 494526a..cca14ed 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1858,7 +1858,7 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (ret & VM_FAULT_RETRY) {
if (nonblocking)
*nonblocking = 0;
- return i;
+ return i ? i : -ERESTARTSYS;
}
/*
--
1.7.3.4
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