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Fix possible buffer overflow in NFS-RDMA

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This commit is contained in:
Vitaliy Filippov
2026-05-18 01:17:56 +03:00
parent 84919a10a9
commit c9dfd0f67d
1 changed files with 5 additions and 5 deletions
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src/nfs/nfs_proxy_rdma.cpp
+5 -5
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@@ -586,8 +586,8 @@ send_again:
}
// Estimate reply WR count, create WR and SGE arrays
xdr_write_chunk *reply_chunk = rop->in_rdma_msg.rdma_body.rdma_msg.rdma_reply;
int reply_chunk_wr_count = (reply_chunk ? reply_chunk->target.target_len : 0);
uint32_t wr_count = 1 + (chunk_iov ? 1 : 0) + (reply_chunk ? reply_chunk_wr_count : 0);
uint32_t reply_chunk_wr_count = (reply_chunk ? reply_chunk->target.target_len : 0);
uint32_t wr_count = 1 + (chunk_iov ? 1 : 0) + reply_chunk_wr_count;
if (wr_count > ctx->max_send_wr)
{
fprintf(stderr, "Reply fragmentation (%u) exceeds max_send_wr (%u), sending ERR_CHUNK\n", wr_count, ctx->max_send_wr);
@@ -622,7 +622,7 @@ chunk_error:
{
size_t reply_chunk_len = 0;
size_t left = msg_size;
for (uint32_t i = 0; i < reply_chunk->target.target_len; i++)
for (uint32_t i = 0; i < reply_chunk_wr_count; i++)
{
reply_chunk_len += reply_chunk->target.target_val[i].length;
if (reply_chunk->target.target_val[i].length > left)
@@ -653,7 +653,7 @@ chunk_error:
}
ibv_sge sges[wr_count];
ibv_send_wr wrs[wr_count];
int wr_pos = 0;
uint32_t wr_pos = 0;
// Use a buffer from rdma_malloc for the reply
assert(!rop->buffer);
rop->buffer = rdma_malloc_alloc(conn_dev->alloc, hdr_size+msg_size);
@@ -685,7 +685,7 @@ chunk_error:
if (reply_chunk)
{
size_t pos = hdr_size;
for (uint32_t i = 0; i < reply_chunk->target.target_len && pos < msg_size; i++)
for (uint32_t i = 0; i < reply_chunk_wr_count && pos < msg_size; i++)
{
uint32_t len = (reply_chunk->target.target_val[i].length < msg_size-pos
? reply_chunk->target.target_val[i].length : msg_size-pos);