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-rw-r--r--fs/proc/task_mmu.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 39e4ad4..6f61b7c 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -665,6 +665,10 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
goto out_task;
ret = 0;
+
+ if (!count)
+ goto out_task;
+
mm = get_task_mm(task);
if (!mm)
goto out_task;
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