linux-kernel - [PATCH] staging: gpib: Move free after the variable use has been completed

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Message-ID: <20241015215157.18571-1-everestkc@everestkc.com.np>
Date: Tue, 15 Oct 2024 15:51:55 -0600
From: "Everest K.C." <everestkc@...restkc.com.np>
To: dpenkler@...il.com,
	gregkh@...uxfoundation.org
Cc: "Everest K.C." <everestkc@...restkc.com.np>,
	skhan@...uxfoundation.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: gpib: Move free after the variable use has been completed

The variable `in_data` is freed, but used later in the code.
Fix it by moving the freeing the memory after it use has been
completed.

This issue was reported by Coverity Scan.
Report:
CID 1600783: (#1 of 1): Use after free (USE_AFTER_FREE)
19. pass_freed_arg: Passing freed pointer in_data as an argument to
ni_usb_dump_raw_block.

Fixes: 4e127de14fa7 ("staging: gpib: Add National Instruments USB GPIB driver")
Signed-off-by: Everest K.C. <everestkc@...restkc.com.np>
---
 drivers/staging/gpib/ni_usb/ni_usb_gpib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/gpib/ni_usb/ni_usb_gpib.c b/drivers/staging/gpib/ni_usb/ni_usb_gpib.c
index 1da263676f2a..75f39e1f3ed1 100644
--- a/drivers/staging/gpib/ni_usb/ni_usb_gpib.c
+++ b/drivers/staging/gpib/ni_usb/ni_usb_gpib.c
@@ -690,12 +690,12 @@ static int ni_usb_read(gpib_board_t *board, uint8_t *buffer, size_t length,
 		kfree(in_data);
 		return parse_retval;
 	}
-	kfree(in_data);
 	if (actual_length != length - status.count) {
 		pr_err("%s: actual_length=%i expected=%li\n",
 		       __func__, actual_length, (long)(length - status.count));
 		ni_usb_dump_raw_block(in_data, usb_bytes_read);
 	}
+	kfree(in_data);
 	switch (status.error_code) {
 	case NIUSB_NO_ERROR:
 		retval = 0;
-- 
2.43.0