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KVM: arm64: Fix memory leak in hyp_trace_unload()

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During trace remote loading, hyp_trace_load() allocates the descriptor
pages but fails to store the allocated size in trace_buffer->desc_size.
As a result, when unloading the trace buffer, hyp_trace_unload() calls
free_pages_exact() with a size of 0 which fails to free the memory.

Fix this by updating the descriptor size in trace_buffer->desc_size.

Fixes: 3aed038aac ("KVM: arm64: Add trace remote for the nVHE/pKVM hyp")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://patch.msgid.link/20260521124613.911067-4-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Vincent Donnefort 2026-05-21 13:46:13 +01:00 committed by Marc Zyngier
parent a23780ea9d
commit adae9996c0
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kvm/hyp_trace.c
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@ -249,6 +249,7 @@ static struct trace_buffer_desc *hyp_trace_load(unsigned long size, void *priv)
goto err_free_desc;
trace_buffer->desc = desc;
trace_buffer->desc_size = desc_size;
ret = hyp_trace_buffer_alloc_bpages_backing(trace_buffer, size);
if (ret)
@ -298,6 +299,7 @@ static void hyp_trace_unload(struct trace_buffer_desc *desc, void *priv)
hyp_trace_buffer_free_bpages_backing(trace_buffer);
free_pages_exact(trace_buffer->desc, trace_buffer->desc_size);
trace_buffer->desc = NULL;
trace_buffer->desc_size = 0;
}
static int hyp_trace_enable_tracing(bool enable, void *priv)