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coresight: trbe: Return NULL pointer for allocation failures

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[ Upstream commit 8a55c161f7f9c1aa1c70611b39830d51c83ef36d ]

When the TRBE driver fails to allocate a buffer, it currently returns
the error code "-ENOMEM". However, the caller etm_setup_aux() only
checks for a NULL pointer, so it misses the error. As a result, the
driver continues and eventually causes a kernel panic.

Fix this by returning a NULL pointer from arm_trbe_alloc_buffer() on
allocation failures. This allows that the callers can properly handle
the failure.

Fixes: 3fbf7f011f ("coresight: sink: Add TRBE driver")
Reported-by: Tamas Zsoldos <tamas.zsoldos@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250904-cs_etm_auxsetup_fix_error_handling-v2-1-a502d0bafb95@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Leo Yan 2025-09-04 15:13:52 +01:00 committed by Greg Kroah-Hartman
parent e926dfde8a
commit 9768536f82
1 changed files with 3 additions and 3 deletions
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6
drivers/hwtracing/coresight/coresight-trbe.c
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@ -744,12 +744,12 @@ static void *arm_trbe_alloc_buffer(struct coresight_device *csdev,
buf = kzalloc_node(sizeof(*buf), GFP_KERNEL, trbe_alloc_node(event));
if (!buf)
return ERR_PTR(-ENOMEM);
return NULL;
pglist = kcalloc(nr_pages, sizeof(*pglist), GFP_KERNEL);
if (!pglist) {
kfree(buf);
return ERR_PTR(-ENOMEM);
return NULL;
}
for (i = 0; i < nr_pages; i++)
@ -759,7 +759,7 @@ static void *arm_trbe_alloc_buffer(struct coresight_device *csdev,
if (!buf->trbe_base) {
kfree(pglist);
kfree(buf);
return ERR_PTR(-ENOMEM);
return NULL;
}
buf->trbe_limit = buf->trbe_base + nr_pages * PAGE_SIZE;
buf->trbe_write = buf->trbe_base;