udf: reject invalid block sizes from lvd
PR: 272893 Reported by: Robert Morris <rtm@lcs.mit.edu> Sponsored by: The FreeBSD Foundation MFC after: 1 week
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@ -413,6 +413,11 @@ udf_mountfs(struct vnode *devvp, struct mount *mp)
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lvd = (struct logvol_desc *)bp->b_data;
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if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) {
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udfmp->bsize = le32toh(lvd->lb_size);
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if (udfmp->bsize < 0 || udfmp->bsize > maxbcachebuf) {
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printf("lvd block size %d\n", udfmp->bsize);
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error = EINVAL;
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goto bail;
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}
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udfmp->bmask = udfmp->bsize - 1;
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udfmp->bshift = ffs(udfmp->bsize) - 1;
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fsd_part = le16toh(lvd->_lvd_use.fsd_loc.loc.part_num);
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