lib: os: mpsc_pbuf: Add guard for oversized allocation
Added early return from mpsc_pbuf_alloc when requested size
exceed the buffer capacity. Previously, in that case buffer
was falling into endless loop.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
diff --git a/lib/os/mpsc_pbuf.c b/lib/os/mpsc_pbuf.c
index 0d23aac..ec35ea0 100644
--- a/lib/os/mpsc_pbuf.c
+++ b/lib/os/mpsc_pbuf.c
@@ -209,6 +209,12 @@
uint32_t free_wlen;
MPSC_PBUF_DBG(buffer, "alloc %d words, ", (int)wlen);
+
+ if (wlen > (buffer->size - 1)) {
+ MPSC_PBUF_DBG(buffer, "Failed to alloc, ");
+ return NULL;
+ }
+
do {
k_spinlock_key_t key;
bool wrap;
