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jtag/drivers/cmsis_dap_usb_bulk: fix clang warning 

Clang static analyzer warnings
"1st function call argument is an uninitialized value"
on the first libusb_free_transfer() parameter (lines 423, 424)
could turn into a real problem in a corner case:
If allocation of a libusb transfer struct fails, the pointers of not yet
allocated transfers remain uninitialized.

Use calloc() to zero whole struct cmsis_dap_backend_data.

Fixes: fd75e9e542 (jtag/drivers/cmsis_dap_bulk: use asynchronous libusb transfer)
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Change-Id: I0e489757d82d10ed7416c5e8c215e1facc7f8093
Reviewed-on: https://review.openocd.org/c/openocd/+/8045
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Tomas Vanek 2023-12-10 15:03:46 +01:00 committed by Antonio Borneo
parent ea2e26f7d5
commit 43e1d60e77
1 changed files with 1 additions and 1 deletions
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src/jtag/drivers/cmsis_dap_usb_bulk.c
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@ -362,7 +362,7 @@ static int cmsis_dap_usb_open(struct cmsis_dap *dap, uint16_t vids[], uint16_t p
if (err)
LOG_WARNING("could not claim interface: %s", libusb_strerror(err));
dap->bdata = malloc(sizeof(struct cmsis_dap_backend_data));
dap->bdata = calloc(1, sizeof(struct cmsis_dap_backend_data));
if (!dap->bdata) {
LOG_ERROR("unable to allocate memory");
libusb_release_interface(dev_handle, interface_num);