Commit 7d31acda authored by Tilman Schmidt's avatar Tilman Schmidt Committed by David S. Miller

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: default avatarTilman Schmidt <tilman@imap.cc>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4793d15b
...@@ -989,6 +989,8 @@ _cdebbuf *capi_cmsg2str(_cmsg * cmsg) ...@@ -989,6 +989,8 @@ _cdebbuf *capi_cmsg2str(_cmsg * cmsg)
{ {
_cdebbuf *cdb; _cdebbuf *cdb;
if (!cmsg->m)
return NULL; /* no message */
cdb = cdebbuf_alloc(); cdb = cdebbuf_alloc();
if (!cdb) if (!cdb)
return NULL; return NULL;
......
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