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staging: gpib: Move free after the variable use has been completed

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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: 4e127de14f ("staging: gpib: Add National Instruments USB GPIB driver")
Signed-off-by: Everest K.C. <everestkc@everestkc.com.np>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20241015215157.18571-1-everestkc@everestkc.com.np
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Everest K.C.
2024-10-15 15:51:55 -06:00
committed by Greg Kroah-Hartman
parent afa0ab042e
commit b0a7dfeb7d
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/gpib/ni_usb/ni_usb_gpib.c
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@@ -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;