Re: mdadm segfault at assemble

[NeilBrown <neilb@suse.de>]

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On Wed, 15 Feb 2012 08:54:32 +0100 Arkadiusz Miśkiewicz <arekm@maven.pl>
wrote:

> 
> Hi,
> 
> mapfile.c:434 
> 
> struct mddev_ident *match = conf_match(st, info, NULL, 0, NULL);
> 
> so devname is NULL and that's passed down to fnmatch in match_oneof causing 
> segfault.
> 
> Looked at git and it seems to be the same as in mine 3.2.3 version.
> 
> Starting program: /sbin/mdadm --assemble --scan --auto=yes
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0xb7ef9f15 in fnmatch () from /lib/libc.so.6
> (gdb) bt
> #0  0xb7ef9f15 in fnmatch () from /lib/libc.so.6
> #1  0x08051caf in match_oneof (devices=0x80dea79 ",/dev/sdb3", devname=0x0) at 
> config.c:958
> #2  0x08052051 in conf_match (st=0x80def50, info=0x80e11b8, devname=0x0, 
> verbose=0, rvp=0x0) at config.c:1049
> #3  0x080a8e0c in RebuildMap () at mapfile.c:434
> #4  0x080a865b in map_read (melp=0xbffff8a4) at mapfile.c:201
> #5  0x080a8526 in map_lock (melp=0xbffff8a4) at mapfile.c:145
> #6  0x0804e0f6 in main (argc=4, argv=0xbffffc54) at mdadm.c:1320
> 

Thanks for the report.

This should fix it.

NeilBrown


commit 9f1b0f0f1ed0dd4752be65348a24971335cd50e8
Author: NeilBrown <neilb@suse.de>
Date:   Thu Feb 16 14:11:57 2012 +1100

    config: conf_match should ignore devname when not set.
    
    mapfile:RebuildMap calls conf_match with no devname, so we must be
    careful not to use it.
    
    Reported-by: Arkadiusz Miśkiewicz <arekm@maven.pl>
    Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/config.c b/config.c
index 6027b2f..d8f48e1 100644
--- a/config.c
+++ b/config.c
@@ -1045,7 +1045,7 @@ struct mddev_ident *conf_match(struct supertype *st,
 					array_list->devname);
 			continue;
 		}
-		if (array_list->devices &&
+		if (array_list->devices && devname &&
 		    !match_oneof(array_list->devices, devname)) {
 			if (verbose >= 2 && array_list->devname)
 				fprintf(stderr, Name

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