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| author | phk <phk@FreeBSD.org> | 1996-10-21 19:40:01 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1996-10-21 19:40:01 +0000 |
| commit | b6475895358f64f460bc7b240ea116e28efe0355 (patch) | |
| tree | 18e423f667ae7704fe4f82d8d1af09110943075c /sbin/dumpfs | |
| parent | 4256f5443cf3efbd469bb0c867d7d28d40133a99 (diff) | |
| download | FreeBSD-src-b6475895358f64f460bc7b240ea116e28efe0355.zip FreeBSD-src-b6475895358f64f460bc7b240ea116e28efe0355.tar.gz | |
dumpfs blindly trusts that it has been handed a filesystem.
If the magic is bad, don't waste our time.
Submitted by: Giles Lean Giles Lean <giles@nemeton.com.au>
Obtained from: NetBSD PR bin/249
Diffstat (limited to 'sbin/dumpfs')
| -rw-r--r-- | sbin/dumpfs/dumpfs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sbin/dumpfs/dumpfs.c b/sbin/dumpfs/dumpfs.c index 34b0674..bcde08a 100644 --- a/sbin/dumpfs/dumpfs.c +++ b/sbin/dumpfs/dumpfs.c @@ -115,6 +115,13 @@ dumpfs(name) if (read(fd, &afs, SBSIZE) != SBSIZE) goto err; + if (afs.fs_magic != FS_MAGIC) { + warnx("%s: superblock has bad magic number, skipping.", + name); + (void) close(fd); + return (1); + } + if (afs.fs_postblformat == FS_42POSTBLFMT) afs.fs_nrpos = 8; dev_bsize = afs.fs_fsize / fsbtodb(&afs, 1); |
