From: Andrii Nakryiko <andrii@kernel.org>
Date: Fri, 6 Dec 2024 18:34:36 +0000 (-0800)
Subject: uprobes: Guard against kmemdup() failing in dup_return_instance()
X-Git-Tag: ceph-for-6.15-rc4~448^2~4
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=02c56362a7d3eccc209d5c00d73a06513d2504d5;p=ceph-client.git

uprobes: Guard against kmemdup() failing in dup_return_instance()

If kmemdup() failed to alloc memory, don't proceed with extra_consumers
copy.

Fixes: e62f2d492728 ("uprobes: Simplify session consumer tracking")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241206183436.968068-1-andrii@kernel.org
---

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 1af950208c2b..1f75a2f91206 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -2048,6 +2048,8 @@ static struct return_instance *dup_return_instance(struct return_instance *old)
 	struct return_instance *ri;
 
 	ri = kmemdup(old, sizeof(*ri), GFP_KERNEL);
+	if (!ri)
+		return NULL;
 
 	if (unlikely(old->cons_cnt > 1)) {
 		ri->extra_consumers = kmemdup(old->extra_consumers,