Tilman Schmidt 7d31acda9f
isdn: prevent NULL ptr Oops in capi_cmsg2str() ...
The dereferencing of the private pointer cmsg->m in capi_cmsg2str() may
cause an Oops in case of an error, which is particularly inconvenient
as that function is typically used to format an error message. Add a
NULL pointer check to avoid this.
Impact: error handling improvement
Signed-off-by: Tilman Schmidt <tilman@imap.cc >
Signed-off-by: David S. Miller <davem@davemloft.net >
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