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authorKevin Brodsky <kevin.brodsky@arm.com>2023-04-13 14:47:04 +0300
committerDavid S. Miller <davem@davemloft.net>2023-04-14 13:09:27 +0300
commit60daf8d40b80ccbd593930235aea9ee82ea8dbc2 (patch)
tree766b0dbf9a6c7cc855c5bdf5b3f43f964885b42b /net/compat.c
parentc39ef2130491b2382f2c81774c825527d4bdf4e2 (diff)
downloadlinux-60daf8d40b80ccbd593930235aea9ee82ea8dbc2.tar.xz
net/compat: Update msg_control_is_user when setting a kernel pointer
cmsghdr_from_user_compat_to_kern() is an unusual case w.r.t. how the kmsg->msg_control* fields are used. The input struct msghdr holds a pointer to a user buffer, i.e. ksmg->msg_control_user is active. However, upon success, a kernel pointer is stored in kmsg->msg_control. kmsg->msg_control_is_user should therefore be updated accordingly. Cc: Christoph Hellwig <hch@lst.de> Cc: Eric Dumazet <edumazet@google.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/compat.c')
-rw-r--r--net/compat.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/compat.c b/net/compat.c
index 000a2e054d4c..6564720f32b7 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -211,6 +211,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
goto Einval;
/* Ok, looks like we made it. Hook it up and return success. */
+ kmsg->msg_control_is_user = false;
kmsg->msg_control = kcmsg_base;
kmsg->msg_controllen = kcmlen;
return 0;