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[JFFS2] Check for creation of dirents with embedded zero bytes in name.

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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>
This commit is contained in:
David Woodhouse 2007-10-13 11:33:50 +01:00
parent a8c68f3264
commit 69ca4378aa
1 changed files with 12 additions and 1 deletions
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13
fs/jffs2/write.c
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@ -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;