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bpf/xskmap: Return ERR_PTR for failure case instead of NULL. 

When kzalloc() failed, NULL was returned to the caller, which
tested the pointer with IS_ERR(), which didn't match, so the
pointer was used later, resulting in a NULL dereference.

Return ERR_PTR(-ENOMEM) instead of NULL.

Reported-by: syzbot+491c1b7565ba9069ecae@syzkaller.appspotmail.com
Fixes: 0402acd683 ("xsk: remove AF_XDP socket from map when the socket is released")
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jonathan Lemon 2019-09-24 09:25:21 -07:00 committed by Daniel Borkmann
parent 8a03222f50
commit fcd30ae066
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/xskmap.c
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@ -37,7 +37,7 @@ static struct xsk_map_node *xsk_map_node_alloc(struct xsk_map *map,
node = kzalloc(sizeof(*node), GFP_ATOMIC | __GFP_NOWARN); node = kzalloc(sizeof(*node), GFP_ATOMIC | __GFP_NOWARN);
if (!node) if (!node)
return NULL; return ERR_PTR(-ENOMEM);
err = xsk_map_inc(map); err = xsk_map_inc(map);
if (err) { if (err) {