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| author | Jens Axboe <axboe@kernel.dk> | 2022-07-15 15:54:47 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-24 18:39:18 -0600 |
| commit | 4f6a94d337408f23e199eee7d35ed6edc201df0c (patch) | |
| tree | ec0244303b6a45dc26dce70b243cf40ad261d6fc /net/compat.c | |
| parent | 48904229928d941ce1db181b991948387ab463cd (diff) | |
| download | lwn-4f6a94d337408f23e199eee7d35ed6edc201df0c.tar.gz lwn-4f6a94d337408f23e199eee7d35ed6edc201df0c.zip | |
net: fix compat pointer in get_compat_msghdr()
A previous change enabled external users to copy the data before
calling __get_compat_msghdr(), but didn't modify get_compat_msghdr() or
__io_compat_recvmsg_copy_hdr() to take that into account. They are both
stil passing in the __user pointer rather than the copied version.
Ensure we pass in the kernel struct, not the pointer to the user data.
Link: https://lore.kernel.org/all/46439555-644d-08a1-7d66-16f8f9a320f0@samsung.com/
Fixes: 1a3e4e94a1b9 ("net: copy from user before calling __get_compat_msghdr")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'net/compat.c')
| -rw-r--r-- | net/compat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/compat.c b/net/compat.c index 513aa9a3fc64..ed880729d159 100644 --- a/net/compat.c +++ b/net/compat.c @@ -89,7 +89,7 @@ int get_compat_msghdr(struct msghdr *kmsg, if (copy_from_user(&msg, umsg, sizeof(*umsg))) return -EFAULT; - err = __get_compat_msghdr(kmsg, umsg, save_addr); + err = __get_compat_msghdr(kmsg, &msg, save_addr); if (err) return err; |