From 9b177a7d1cea8d43ddec29c85dc997548c1b9dcc Mon Sep 17 00:00:00 2001 From: Sami Tolvanen Date: Fri, 10 Jan 2020 13:33:49 -0800 Subject: [PATCH] FROMLIST: lib/list_sort: fix function type mismatches Casting the comparison function to a different type trips indirect call Control-Flow Integrity (CFI) checking. Remove the additional consts from cmp_func, and the now unneeded casts. Fixes: 043b3f7b6388 ("lib/list_sort: simplify and remove MAX_LIST_LENGTH_BITS") (am from https://lore.kernel.org/patchwork/patch/1178059/) Link: https://lore.kernel.org/lkml/20200110225602.91663-1-samitolvanen@google.com Bug: 147506196 Change-Id: I329b1a454c30af78f9851db6a38c3f060499ec0d Signed-off-by: Sami Tolvanen Signed-off-by: Todd Kjos --- lib/list_sort.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/lib/list_sort.c b/lib/list_sort.c index 52f0c258c895..b14accf4ef83 100644 --- a/lib/list_sort.c +++ b/lib/list_sort.c @@ -8,7 +8,7 @@ #include typedef int __attribute__((nonnull(2,3))) (*cmp_func)(void *, - struct list_head const *, struct list_head const *); + struct list_head *, struct list_head *); /* * Returns a list organized in an intermediate format suited @@ -227,7 +227,7 @@ void list_sort(void *priv, struct list_head *head, if (likely(bits)) { struct list_head *a = *tail, *b = a->prev; - a = merge(priv, (cmp_func)cmp, b, a); + a = merge(priv, cmp, b, a); /* Install the merged result in place of the inputs */ a->prev = b->prev; *tail = a; @@ -249,10 +249,10 @@ void list_sort(void *priv, struct list_head *head, if (!next) break; - list = merge(priv, (cmp_func)cmp, pending, list); + list = merge(priv, cmp, pending, list); pending = next; } /* The final merge, rebuilding prev links */ - merge_final(priv, (cmp_func)cmp, head, pending, list); + merge_final(priv, cmp, head, pending, list); } EXPORT_SYMBOL(list_sort);