Hi<tt> Bart,</tt> Thanks for your answer. I commit the code again with the title "segment faulty occured in add_feature()", please review. Thanks, Wei huang. <table width=100%> <tr valign=top> <td width=36%>Bart Van Assche <bart.vanassche@sandisk.com> 2016-10-28 23:14 <td width=63%> <table width=100%> <tr valign=top> <td> <div align=right>收件人</div> <td><huang.wei56@zte.com.cn>, Christophe Varoqui <christophe.varoqui@opensvc.com>, <tr valign=top> <td> <div align=right>抄送</div> <td><tang.junhui@zte.com.cn>, <zhang.kai16@zte.com.cn>, <dm-devel@redhat.com> <tr valign=top> <td> <div align=right>主题</div> <td>Re: [dm-devel] [PATCH] add_feature: coredump</table> <table> <tr valign=top> <td> <td></table> </table> <tt>On 10/13/2016 07:08 PM, huang.wei56@zte.com.cn wrote: > From: "wei.huang" <huang.wei56@zte.com.cn> > > Problem: > when we configure device like vendor is COMPELNT in multipath.conf, multipathd will be coredump. > > Reasons: > some vonders are not configured features in default_hw. In add_feature, strstr's first parameter *f maybe null. > > Signed-off-by: wei.huang <huang.wei56@zte.com.cn> > --- > libmultipath/structs.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/libmultipath/structs.c b/libmultipath/structs.c > index fee58e5..41e142f 100644 > --- a/libmultipath/structs.c > +++ b/libmultipath/structs.c > @@ -520,6 +520,20 @@ add_feature (char **f, char *n) > if (!n || *n == '0') > return 0; > > + /* default feature is null */ > + if(!*f) > + { > + l = strlen("1 ") + strlen(n) + 1; > + t = MALLOC(l); > + if (!t) > + return 1; > + > + snprintf(t, l, "1 %s", n); > + *f = t; > + > + return 0; > + } > + > /* Check if feature is already present */ > if (strstr(*f, n)) > return 0; > Hello Wei Huang, Please use asprintf() instead of open coding it and please also make the title of your patch comprehensible. Your patch avoids that multipathd triggers a core dump for a certain vendor name but that's not clear from the "add_feature: coredump". Thanks, Bart. </tt>