nfsd: use dynamic allocation for oversized NFSv4.0 replay cache

Commit 1e8e9913672a ("nfsd: fix heap overflow in NFSv4.0 LOCK
replay cache") capped the replay cache copy at NFSD4_REPLAY_ISIZE
to prevent a heap overflow, but set rp_buflen to zero when the
encoded response exceeded the inline buffer. A retransmitted LOCK
reaching the replay path then produced only a status code with no
operation body, resulting in a malformed XDR response.

When the encoded response exceeds the 112-byte inline rp_ibuf, a
buffer is kmalloc'd to hold it. If the allocation fails, rp_buflen
remains zero, preserving the behavior from the capped-copy fix.
The buffer is freed when the stateowner is released or when a
subsequent operation's response fits in the inline buffer.

Fixes: 1e8e9913672a ("nfsd: fix heap overflow in NFSv4.0 LOCK replay cache")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

0 files changed, 0 insertions, 0 deletions