From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx2.suse.de ([195.135.220.15]) by bombadil.infradead.org with esmtps (Exim 4.69 #1 (Red Hat Linux)) id 1LgM8n-00057O-G0 for linux-mtd@lists.infradead.org; Sun, 08 Mar 2009 16:46:20 +0000 Received: from Relay2.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id A91F0473B2 for ; Sun, 8 Mar 2009 17:46:13 +0100 (CET) Date: Sun, 8 Mar 2009 17:46:10 +0100 From: Stefan Seyfried To: linux-mtd@lists.infradead.org Subject: Re: mkfs.jffs2 aborts with MALLOC_CHECK_=2 on x86_64 Message-ID: <20090308164610.GA25396@suse.de> References: <49710071.3000504@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <49710071.3000504@suse.de> List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, Jan 16, 2009 at 10:47:29PM +0100, Stefan Seyfried wrote: > Hi, > > current mtd-utils' mkfs.jffs2 aborts on me: > seife@stoetzler:~> /dev/shm/mtd-utils/mkfs.jffs2 -L > mkfs.jffs2: > lzo priority:80 disabled > zlib priority:60 enabled > rtime priority:50 enabled > > seife@stoetzler:~> MALLOC_CHECK_=2 /dev/shm/mtd-utils/mkfs.jffs2 -U -b -e > 131072 -p -r . -o /tmp/img.jffs2 > Aborted > I looked around and found out that it happens, when both enabled compressors > return -1 in compr.c line 246, and then the free in line 258 aborts. > > doing > > #define STREAM_END_SPACE 20 > > instead of the default of 12 in compr_zlib.c fixes it for me. However, I'm > neither shure if this has any bad side effects, nor _why_ it fixes it. > My host is 64bits (x86_64), maybe this is affecting the buffer sizes or > something like that. > Hope this is helpful. valgrind was much more helpful than gdb in this case. I'm pretty sure it's an integer underflow: it happens when jffs2_rtime_compress is called with *dstlen = 1 The same in compr_zlib has not triggered for me yet, but is probably worth fixing anyway. diff --git a/compr_rtime.c b/compr_rtime.c index 131536c..7353024 100644 --- a/compr_rtime.c +++ b/compr_rtime.c @@ -32,7 +32,7 @@ static int jffs2_rtime_compress(unsigned char *data_in, unsigned char *cpage_out memset(positions,0,sizeof(positions)); - while (pos < (*sourcelen) && outpos <= (*dstlen)-2) { + while (pos < (*sourcelen) && outpos+2 <= *dstlen) { int backpos, runlen=0; unsigned char value; diff --git a/compr_zlib.c b/compr_zlib.c index 400b18a..eb415b9 100644 --- a/compr_zlib.c +++ b/compr_zlib.c @@ -71,7 +71,7 @@ int jffs2_zlib_compress(unsigned char *data_in, unsigned char *cpage_out, strm.next_out = cpage_out; strm.total_out = 0; - while (strm.total_out < *dstlen - STREAM_END_SPACE && strm.total_in < *sourcelen) { + while (strm.total_out + STREAM_END_SPACE < *dstlen && strm.total_in < *sourcelen) { strm.avail_out = *dstlen - (strm.total_out + STREAM_END_SPACE); strm.avail_in = min((unsigned)(*sourcelen-strm.total_in), strm.avail_out); ret = deflate(&strm, Z_PARTIAL_FLUSH); -- Stefan Seyfried R&D Team Mobile Devices | "Any ideas, John?" SUSE LINUX Products GmbH, Nürnberg | "Well, surrounding them's out." This footer brought to you by insane German lawmakers: SUSE Linux Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)