--- /dev/null
+++ b/crypto/unlzma.c
-@@ -0,0 +1,710 @@
+@@ -0,0 +1,748 @@
+/*
+ * LZMA uncompresion module for pcomp
+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
+#include <linux/kthread.h>
+
+#include <crypto/internal/compress.h>
++#include <net/netlink.h>
+#include "unlzma.h"
+
+static int instance = 0;
+
+struct unlzma_buffer {
-+ struct unlzma_buffer *last;
+ int offset;
+ int size;
+ u8 *ptr;
+ /* writer state */
+ u8 previous_byte;
+ ssize_t pos;
-+ struct unlzma_buffer *head;
++ int buf_full;
++ int n_buffers;
++ int buffers_max;
++ struct unlzma_buffer *buffers;
+
+ /* cstate */
+ int state;
+}
+
+static void
++get_buffer(struct unlzma_ctx *ctx)
++{
++ struct unlzma_buffer *bh;
++
++ BUG_ON(ctx->n_buffers >= ctx->buffers_max);
++ bh = &ctx->buffers[ctx->n_buffers++];
++ bh->ptr = ctx->next_out;
++ bh->offset = ctx->pos;
++ bh->size = ctx->avail_out;
++ ctx->buf_full = 0;
++}
++
++static void
+unlzma_request_buffer(struct unlzma_ctx *ctx, int *avail)
+{
-+ mutex_unlock(&ctx->mutex);
-+ wait_event(ctx->next_req, unlzma_should_stop(ctx) || (*avail > 0));
-+ mutex_lock(&ctx->mutex);
++ do {
++ mutex_unlock(&ctx->mutex);
++ if (wait_event_interruptible(ctx->next_req,
++ unlzma_should_stop(ctx) || (*avail > 0)))
++ schedule();
++ mutex_lock(&ctx->mutex);
++ } while (*avail <= 0 && !unlzma_should_stop(ctx));
++
++ if (!unlzma_should_stop(ctx) && ctx->buf_full)
++ get_buffer(ctx);
+}
+
+static u8
+static u8
+peek_old_byte(struct unlzma_ctx *ctx, u32 offs)
+{
-+ struct unlzma_buffer *bh = ctx->head;
++ struct unlzma_buffer *bh = &ctx->buffers[ctx->n_buffers - 1];
++ int i = ctx->n_buffers;
+ u32 pos;
+
++ BUG_ON(!ctx->n_buffers);
+ pos = ctx->pos - offs;
+ if (pos >= ctx->dict_size) {
+ pos = (~pos % ctx->dict_size);
+ }
+
+ while (bh->offset > pos) {
-+ bh = bh->last;
-+ if (!bh)
-+ return 0;
++ bh--;
++ i--;
++ BUG_ON(!i);
+ }
+
+ pos -= bh->offset;
-+ if (pos > bh->size)
-+ return 0;
++ BUG_ON(pos >= bh->size);
+
+ return bh->ptr[pos];
+}
+
+static void
-+get_buffer(struct unlzma_ctx *ctx)
-+{
-+ struct unlzma_buffer *bh;
-+
-+ bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
-+ bh->ptr = ctx->next_out;
-+ bh->offset = ctx->pos;
-+ bh->last = ctx->head;
-+ bh->size = ctx->avail_out;
-+ ctx->head = bh;
-+}
-+
-+static void
+write_byte(struct unlzma_ctx *ctx, u8 byte)
+{
+ if (unlikely(ctx->avail_out <= 0)) {
+ unlzma_request_buffer(ctx, &ctx->avail_out);
-+ get_buffer(ctx);
+ }
+
+ if (!ctx->avail_out)
+ ctx->previous_byte = byte;
+ *(ctx->next_out++) = byte;
+ ctx->avail_out--;
++ if (ctx->avail_out == 0)
++ ctx->buf_full = 1;
+ ctx->pos++;
+}
+
+ hdr_buf[i] = rc_read(ctx);
+ }
+
++ ctx->n_buffers = 0;
+ ctx->pos = 0;
+ get_buffer(ctx);
+ ctx->active = true;
+ if (ctx->workspace_size < num_probs * sizeof(*p)) {
+ if (ctx->workspace)
+ vfree(ctx->workspace);
-+ ctx->workspace = vmalloc(num_probs * sizeof(*p));
++ ctx->workspace_size = num_probs * sizeof(*p);
++ ctx->workspace = vmalloc(ctx->workspace_size);
+ }
+ p = (u16 *) ctx->workspace;
+ if (!p)
+ if (unlzma_should_stop(ctx))
+ break;
+ }
++ if (likely(!unlzma_should_stop(ctx)))
++ rc_normalize(ctx);
+
+ return ctx->pos;
+}
+ unlzma_reset_buf(ctx);
+ ctx->cancel = false;
+ ctx->active = false;
-+ while (ctx->head) {
-+ struct unlzma_buffer *bh = ctx->head;
-+ ctx->head = bh->last;
-+ kfree(bh);
-+ }
+ } while (!kthread_should_stop());
+ mutex_unlock(&ctx->mutex);
+ return 0;
+ unlzma_cancel(ctx);
+ kthread_stop(ctx->thread);
+ ctx->thread = NULL;
++ if (ctx->buffers)
++ kfree(ctx->buffers);
++ ctx->buffers_max = 0;
++ ctx->buffers = NULL;
+ }
+}
+
+unlzma_decompress_setup(struct crypto_pcomp *tfm, void *p, unsigned int len)
+{
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++ struct nlattr *tb[UNLZMA_DECOMP_MAX + 1];
+ int ret = 0;
+
+ if (ctx->thread)
-+ return 0;
++ return -EINVAL;
++
++ if (!p)
++ return -EINVAL;
++
++ ret = nla_parse(tb, UNLZMA_DECOMP_MAX, p, len, NULL);
++ if (!tb[UNLZMA_DECOMP_OUT_BUFFERS])
++ return -EINVAL;
++
++ if (ctx->buffers_max && (ctx->buffers_max <
++ nla_get_u32(tb[UNLZMA_DECOMP_OUT_BUFFERS]))) {
++ kfree(ctx->buffers);
++ ctx->buffers_max = 0;
++ ctx->buffers = NULL;
++ }
++ if (!ctx->buffers) {
++ ctx->buffers_max = nla_get_u32(tb[UNLZMA_DECOMP_OUT_BUFFERS]);
++ ctx->buffers = kzalloc(sizeof(struct unlzma_buffer) * ctx->buffers_max, GFP_KERNEL);
++ }
++ if (!ctx->buffers)
++ return -ENOMEM;
+
+ mutex_init(&ctx->mutex);
+ init_waitqueue_head(&ctx->next_req);
+ req->avail_in = ctx->avail_in;
+ req->next_out = ctx->next_out;
+ req->avail_out = ctx->avail_out;
++ ctx->next_in = 0;
++ ctx->avail_in = 0;
+ pos = ctx->pos - pos;
+
+out:
+#define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS)
+
+#endif
+--- a/include/crypto/compress.h
++++ b/include/crypto/compress.h
+@@ -49,6 +49,12 @@ enum zlib_decomp_params {
+
+ #define ZLIB_DECOMP_MAX (__ZLIB_DECOMP_MAX - 1)
+
++enum unlzma_decomp_params {
++ UNLZMA_DECOMP_OUT_BUFFERS = 1, /* naximum number of output buffers */
++ __UNLZMA_DECOMP_MAX,
++};
++#define UNLZMA_DECOMP_MAX (__UNLZMA_DECOMP_MAX - 1)
++
+
+ struct crypto_pcomp {
+ struct crypto_tfm base;
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