From 8f332287bc3f2801ba43682fd79baf24dc8ac1ce Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Date: Mon, 16 May 2005 21:53:14 -0700 Subject: [PATCH] [PATCH] uml: change memcpy to memmove Replace one memcpy() call with overlapping source and dest arguments with one call to memmove(), to avoid data corruption. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> --- arch/um/kernel/irq_user.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/um/kernel/irq_user.c b/arch/um/kernel/irq_user.c index 6d6f9484b884d3..b3074cbaa479ac 100644 --- a/arch/um/kernel/irq_user.c +++ b/arch/um/kernel/irq_user.c @@ -236,9 +236,15 @@ static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg) (*prev)->fd, pollfds[i].fd); goto out; } - memcpy(&pollfds[i], &pollfds[i + 1], - (pollfds_num - i - 1) * sizeof(pollfds[0])); + pollfds_num--; + + /* This moves the *whole* array after pollfds[i] (though + * it doesn't spot as such)! */ + + memmove(&pollfds[i], &pollfds[i + 1], + (pollfds_num - i) * sizeof(pollfds[0])); + if(last_irq_ptr == &old_fd->next) last_irq_ptr = prev; *prev = (*prev)->next; -- GitLab