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| author | Johan Hovold <johan+linaro@kernel.org> | 2022-08-29 10:05:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-01 16:13:07 +0200 |
| commit | 9baa1415d9abdd1e08362ea2dcfadfacee8690b5 (patch) | |
| tree | a5ba902340271a7582c78dc621f1609acb8b18a1 | |
| parent | 5ef251b9b73ff9f62aa5ac60427af05b2b594a55 (diff) | |
| download | linux-9baa1415d9abdd1e08362ea2dcfadfacee8690b5.tar.gz linux-9baa1415d9abdd1e08362ea2dcfadfacee8690b5.tar.bz2 linux-9baa1415d9abdd1e08362ea2dcfadfacee8690b5.zip | |
misc: fastrpc: fix memory corruption on probe
Add the missing sanity check on the probed-session count to avoid
corrupting memory beyond the fixed-size slab-allocated session array
when there are more than FASTRPC_MAX_SESSIONS sessions defined in the
devicetree.
Fixes: f6f9279f2bf0 ("misc: fastrpc: Add Qualcomm fastrpc basic driver model")
Cc: stable@vger.kernel.org # 5.1
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220829080531.29681-2-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/misc/fastrpc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 93ebd174d848..88091778c1b8 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -1943,6 +1943,11 @@ static int fastrpc_cb_probe(struct platform_device *pdev) of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); spin_lock_irqsave(&cctx->lock, flags); + if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) { + dev_err(&pdev->dev, "too many sessions\n"); + spin_unlock_irqrestore(&cctx->lock, flags); + return -ENOSPC; + } sess = &cctx->session[cctx->sesscount]; sess->used = false; sess->valid = true; |