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| author | David Woodhouse <dwmw2@infradead.org> | 2007-10-13 11:33:50 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-10-13 11:33:50 +0100 |
| commit | 69ca4378aa376cf2c49657d4f6951da56c27cd3a (patch) | |
| tree | e1d8c8eb423f8a88be02f949ef88539c1f1bd8eb /fs/jffs2 | |
| parent | a8c68f32644fc8942b25af9239967dd01be621fa (diff) | |
| download | linux-69ca4378aa376cf2c49657d4f6951da56c27cd3a.tar.gz linux-69ca4378aa376cf2c49657d4f6951da56c27cd3a.tar.bz2 linux-69ca4378aa376cf2c49657d4f6951da56c27cd3a.zip | |
[JFFS2] Check for creation of dirents with embedded zero bytes in name.
I have no idea how this happened, but OLPC trac #4184 suggests that it
did. Catch it early.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'fs/jffs2')
| -rw-r--r-- | fs/jffs2/write.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/jffs2/write.c b/fs/jffs2/write.c index 664c164aa67c..2f5695446d0f 100644 --- a/fs/jffs2/write.c +++ b/fs/jffs2/write.c @@ -215,6 +215,17 @@ struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jff BUG(); }); + if (strnlen(name, namelen) != namelen) { + /* This should never happen, but seems to have done on at least one + occasion: https://dev.laptop.org/ticket/4184 */ + printk(KERN_CRIT "Error in jffs2_write_dirent() -- name contains zero bytes!\n"); + printk(KERN_CRIT "Directory inode #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x\n", + je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), + je32_to_cpu(rd->name_crc)); + WARN_ON(1); + return ERR_PTR(-EIO); + } + vecs[0].iov_base = rd; vecs[0].iov_len = sizeof(*rd); vecs[1].iov_base = (unsigned char *)name; @@ -226,7 +237,7 @@ struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jff fd->version = je32_to_cpu(rd->version); fd->ino = je32_to_cpu(rd->ino); - fd->nhash = full_name_hash(name, strlen(name)); + fd->nhash = full_name_hash(name, namelen); fd->type = rd->type; memcpy(fd->name, name, namelen); fd->name[namelen]=0; |