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block/sed: Check received header lengths

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Add a buffer size check against discovery and response header lengths
before we loop over their buffers.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Reviewed-by: Scott Bauer <scott.bauer@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jon Derrick 2017-02-21 11:59:15 -07:00 committed by Jens Axboe
parent cccb92417d
commit 77039b9631
1 changed files with 20 additions and 13 deletions
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33
block/sed-opal.c
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@ -411,10 +411,17 @@ static int opal_discovery0_end(struct opal_dev *dev)
const struct d0_header *hdr = (struct d0_header *)dev->resp;
const u8 *epos = dev->resp, *cpos = dev->resp;
u16 comid = 0;
u32 hlen = be32_to_cpu(hdr->length);
print_buffer(dev->resp, be32_to_cpu(hdr->length));
print_buffer(dev->resp, hlen);
epos += be32_to_cpu(hdr->length); /* end of buffer */
if (hlen > IO_BUFFER_LENGTH - sizeof(*hdr)) {
pr_warn("Discovery length overflows buffer (%zu+%u)/%u\n",
sizeof(*hdr), hlen, IO_BUFFER_LENGTH);
return -EFAULT;
}
epos += hlen; /* end of buffer */
cpos += sizeof(*hdr); /* current position on buffer */
while (cpos < epos && supported) {
@ -784,6 +791,7 @@ static int response_parse(const u8 *buf, size_t length,
int total;
ssize_t token_length;
const u8 *pos;
u32 clen, plen, slen;
if (!buf)
return -EFAULT;
@ -795,17 +803,16 @@ static int response_parse(const u8 *buf, size_t length,
pos = buf;
pos += sizeof(*hdr);
pr_debug("Response size: cp: %d, pkt: %d, subpkt: %d\n",
be32_to_cpu(hdr->cp.length),
be32_to_cpu(hdr->pkt.length),
be32_to_cpu(hdr->subpkt.length));
clen = be32_to_cpu(hdr->cp.length);
plen = be32_to_cpu(hdr->pkt.length);
slen = be32_to_cpu(hdr->subpkt.length);
pr_debug("Response size: cp: %u, pkt: %u, subpkt: %u\n",
clen, plen, slen);
if (hdr->cp.length == 0 || hdr->pkt.length == 0 ||
hdr->subpkt.length == 0) {
pr_err("Bad header length. cp: %d, pkt: %d, subpkt: %d\n",
be32_to_cpu(hdr->cp.length),
be32_to_cpu(hdr->pkt.length),
be32_to_cpu(hdr->subpkt.length));
if (clen == 0 || plen == 0 || slen == 0 ||
slen > IO_BUFFER_LENGTH - sizeof(*hdr)) {
pr_err("Bad header length. cp: %u, pkt: %u, subpkt: %u\n",
clen, plen, slen);
print_buffer(pos, sizeof(*hdr));
return -EINVAL;
}
@ -814,7 +821,7 @@ static int response_parse(const u8 *buf, size_t length,
return -EFAULT;
iter = resp->toks;
total = be32_to_cpu(hdr->subpkt.length);
total = slen;
print_buffer(pos, total);
while (total > 0) {
if (pos[0] <= TINY_ATOM_BYTE) /* tiny atom */