[PATCH] fjes: Check possible NULL pointer...

[PATCH] fjes: Check possible NULL pointer returned by vzalloc

From: Jiasheng Jiang <hidden>
Date: 2021-12-29 10:22:11

As the possible alloc failure of the vzalloc(), the 'hw->hw_info.trace'
could be NULL pointer.
Therefore it should be better to check it to guarantee the complete
success of the initiation.

Fixes: 8cdc3f6c5d22 ("fjes: Hardware initialization routine")
Signed-off-by: Jiasheng Jiang <redacted>
---
 drivers/net/fjes/fjes_hw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/fjes/fjes_hw.c b/drivers/net/fjes/fjes_hw.c
index 065bb0a40b1d..4c83f637a135 100644
--- a/drivers/net/fjes/fjes_hw.c
+++ b/drivers/net/fjes/fjes_hw.c

@@ -329,6 +329,9 @@ int fjes_hw_init(struct fjes_hw *hw)
 	ret = fjes_hw_setup(hw);
 
 	hw->hw_info.trace = vzalloc(FJES_DEBUG_BUFFER_SIZE);
+	if (!hw->hw_info.trace)
+		return -ENOMEM;
+
 	hw->hw_info.trace_size = FJES_DEBUG_BUFFER_SIZE;
 
 	return ret;

-- 
2.25.1

Re: [PATCH] fjes: Check possible NULL pointer returned by vzalloc

From: Jakub Kicinski <kuba@kernel.org>
Date: 2021-12-30 02:33:28

On Wed, 29 Dec 2021 18:21:40 +0800 Jiasheng Jiang wrote:

quoted hunk

As the possible alloc failure of the vzalloc(), the 'hw->hw_info.trace'
could be NULL pointer.
Therefore it should be better to check it to guarantee the complete
success of the initiation.

Fixes: 8cdc3f6c5d22 ("fjes: Hardware initialization routine")
Signed-off-by: Jiasheng Jiang <redacted>
---
 drivers/net/fjes/fjes_hw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/fjes/fjes_hw.c b/drivers/net/fjes/fjes_hw.c
index 065bb0a40b1d..4c83f637a135 100644
--- a/drivers/net/fjes/fjes_hw.c
+++ b/drivers/net/fjes/fjes_hw.c

@@ -329,6 +329,9 @@ int fjes_hw_init(struct fjes_hw *hw)
 	ret = fjes_hw_setup(hw);
 
 	hw->hw_info.trace = vzalloc(FJES_DEBUG_BUFFER_SIZE);
+	if (!hw->hw_info.trace)
+		return -ENOMEM;
+
 	hw->hw_info.trace_size = FJES_DEBUG_BUFFER_SIZE;
 
 	return ret;

The rest of this driver is clearly written expecting that
hw_info.trace may be NULL. This change is unnecessary at 
best and may even introduce a regression.

Please do bare minimum of sanity checking your patches.
Your submissions are consistently of very low quality.

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