[tip: perf/urgent] uprobes: Use kzalloc to allocate xol area

[tip-bot2 for Sven Schnelle]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     e240b0fde52f33670d1336697c22d90a4fe33c84
Gitweb:        https://git.kernel.org/tip/e240b0fde52f33670d1336697c22d90a4fe33c84
Author:        Sven Schnelle <svens@xxxxxxxxxxxxx>
AuthorDate:    Tue, 03 Sep 2024 12:23:12 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 03 Sep 2024 16:54:02 +02:00

uprobes: Use kzalloc to allocate xol area

To prevent unitialized members, use kzalloc to allocate
the xol area.

Fixes: b059a453b1cf1 ("x86/vdso: Add mremap hook to vm_special_mapping")
Signed-off-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240903102313.3402529-1-svens@xxxxxxxxxxxxx
---
 kernel/events/uprobes.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 73cc477..50d7949 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1489,7 +1489,7 @@ static struct xol_area *__create_xol_area(unsigned long vaddr)
 	struct xol_area *area;
 	void *insns;
 
-	area = kmalloc(sizeof(*area), GFP_KERNEL);
+	area = kzalloc(sizeof(*area), GFP_KERNEL);
 	if (unlikely(!area))
 		goto out;
 
@@ -1499,7 +1499,6 @@ static struct xol_area *__create_xol_area(unsigned long vaddr)
 		goto free_area;
 
 	area->xol_mapping.name = "[uprobes]";
-	area->xol_mapping.fault = NULL;
 	area->xol_mapping.pages = area->pages;
 	area->pages[0] = alloc_page(GFP_HIGHUSER);
 	if (!area->pages[0])