Date: Thu, 7 Jan 2016 21:43:43 +0000 (UTC) From: "Pedro F. Giffuni" <pfg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r293370 - head/sys/fs/ext2fs Message-ID: <201601072143.u07LhhVo057997@repo.freebsd.org>
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Author: pfg Date: Thu Jan 7 21:43:43 2016 New Revision: 293370 URL: https://svnweb.freebsd.org/changeset/base/293370 Log: ext2fs: reading mmaped file in Ext4 causes panic Always call brelse(path.ep_bp), fixing reading EXT4 files using mmap(). Patch by Damjan Jovanovic. PR: 205938 MFC after: 1 week Modified: head/sys/fs/ext2fs/ext2_bmap.c Modified: head/sys/fs/ext2fs/ext2_bmap.c ============================================================================== --- head/sys/fs/ext2fs/ext2_bmap.c Thu Jan 7 21:16:44 2016 (r293369) +++ head/sys/fs/ext2fs/ext2_bmap.c Thu Jan 7 21:43:43 2016 (r293370) @@ -96,6 +96,7 @@ ext4_bmapext(struct vnode *vp, int32_t b struct ext4_extent *ep; struct ext4_extent_path path = { .ep_bp = NULL }; daddr_t lbn; + int ret = 0; ip = VTOI(vp); fs = ip->i_e2fs; @@ -113,15 +114,21 @@ ext4_bmapext(struct vnode *vp, int32_t b ext4_ext_find_extent(fs, ip, lbn, &path); ep = path.ep_ext; if (ep == NULL) - return (EIO); + ret = EIO; + else { + *bnp = fsbtodb(fs, lbn - ep->e_blk + + (ep->e_start_lo | (daddr_t)ep->e_start_hi << 32)); - *bnp = fsbtodb(fs, lbn - ep->e_blk + - (ep->e_start_lo | (daddr_t)ep->e_start_hi << 32)); + if (*bnp == 0) + *bnp = -1; + } - if (*bnp == 0) - *bnp = -1; + if (path.ep_bp != NULL) { + brelse(path.ep_bp); + path.ep_bp = NULL; + } - return (0); + return (ret); } /*
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