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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@ -989,6 +989,8 @@ _cdebbuf *capi_cmsg2str(_cmsg * cmsg)
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{
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_cdebbuf *cdb;
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if (!cmsg->m)
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return NULL; /* no message */
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cdb = cdebbuf_alloc();
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if (!cdb)
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return NULL;
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