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appletalk: Fix potential NULL pointer dereference in unregister_snap_client

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register_snap_client may return NULL, all the callers
check it, but only print a warning. This will result in
NULL pointer dereference in unregister_snap_client and other
places.

It has always been used like this since v2.6

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YueHaibing 2019-03-14 13:47:59 +08:00 • committed by David S. Miller
parent f261c4e529
commit 9804501fa1
3 changed files with 25 additions and 12 deletions
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2
include/linux/atalk.h
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@ -108,7 +108,7 @@ static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
#define AARP_RESOLVE_TIME (10 * HZ)
extern struct datalink_proto *ddp_dl, *aarp_dl;
extern void aarp_proto_init(void);
extern int aarp_proto_init(void);
/* Inter module exports */