linux/net/netlink
Jason A. Donenfeld fef0035c0f netlink: do not proceed if dump's start() errs
Drivers that use the start method for netlink dumping rely on dumpit not
being called if start fails. For example, ila_xlat.c allocates memory
and assigns it to cb->args[0] in its start() function. It might fail to
do that and return -ENOMEM instead. However, even when returning an
error, dumpit will be called, which, in the example above, quickly
dereferences the memory in cb->args[0], which will OOPS the kernel. This
is but one example of how this goes wrong.

Since start() has always been a function with an int return type, it
therefore makes sense to use it properly, rather than ignoring it. This
patch thus returns early and does not call dumpit() when start() fails.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-09-30 16:13:31 +01:00
..
af_netlink.c netlink: do not proceed if dump's start() errs 2017-09-30 16:13:31 +01:00
af_netlink.h netlink: extended ACK reporting 2017-04-13 13:58:20 -04:00
diag.c netlink/diag: report flags for netlink sockets 2017-04-05 07:13:56 -07:00
genetlink.c netlink: pass extended ACK struct where available 2017-04-13 13:58:22 -04:00
Kconfig netlink: remove mmapped netlink support 2016-02-18 11:42:18 -05:00
Makefile netlink: Diag core and basic socket info dumping (v2) 2013-03-21 12:38:03 -04:00