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um: Fix FD copy size in os_rcv_fd_msg()

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When copying FDs, the copy size should not include the control
message header (cmsghdr). Fix it.

Fixes: 5cde6096a4 ("um: generalize os_rcv_fd")
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Tiwei Bie 2025-09-01 08:27:15 +08:00 • committed by Johannes Berg
parent 7ebf70cf18
commit df447a3b4a
1 changed files with 1 additions and 1 deletions
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2
arch/um/os-Linux/file.c
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@ -535,7 +535,7 @@ ssize_t os_rcv_fd_msg(int fd, int *fds, unsigned int n_fds,
cmsg->cmsg_type != SCM_RIGHTS)
return n;
memcpy(fds, CMSG_DATA(cmsg), cmsg->cmsg_len);
memcpy(fds, CMSG_DATA(cmsg), cmsg->cmsg_len - CMSG_LEN(0));
return n;
}