tree 434a3e4a02eee8491ce732d64bbc927ec37ccd79
parent e987e6352bc9cbc7d925c7110aedd4c254bce439
author Thanassis Avgerinos <thanassis.avgerinos@gmail.com> 1713367802 -0400
committer Vegard Nossum <vegard.nossum@oracle.com> 1717418850 +0000

firewire: nosy: ensure user_length is taken into account when fetching packet contents

commit 38762a0763c10c24a4915feee722d7aa6e73eb98 upstream.

Ensure that packet_buffer_get respects the user_length provided. If
the length of the head packet exceeds the user_length, packet_buffer_get
will now return 0 to signify to the user that no data were read
and a larger buffer size is required. Helps prevent user space overflows.

Signed-off-by: Thanassis Avgerinos <thanassis.avgerinos@gmail.com>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 67f34f093c0f7bf33f5b4ae64d3d695a3b978285)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>