flash/nor/stm32xx: fix segfault accessing Cortex-M part number 52/6752/2
authorTomas Vanek <vanekt@fbl.cz>
Thu, 25 Nov 2021 05:24:52 +0000 (06:24 +0100)
committerTomas Vanek <vanekt@fbl.cz>
Fri, 25 Feb 2022 20:28:02 +0000 (20:28 +0000)
commit13cd75b6ecfd8d9cf04e56b182b6a162ad50247c
treef7bf9ce7a2e1b552ba66701f22704ccceca6bb45
parentb53f5c257185e5410622ed72790affb1bda88248
flash/nor/stm32xx: fix segfault accessing Cortex-M part number

Some of STM32 flash drivers read Cortex-M part number from
cortex_m->core_info.
In corner cases the core_info pointer was observed uninitialised
even if target_was_examined() returned true. See also [1]

Use the new and safe helper to get Cortex-M part number.

While on it switch also target_to_cm()/target_to_armv7m() to the safe
versions. This prevents a crash when the flash bank is misconfigured
with non-Cortex-M target.

Add missing checks for target_was_examined() to flash probes.

[1] 6545: fix crash in case cortex_m->core_info is not set
    https://review.openocd.org/c/openocd/+/6545

Change-Id: If2471af74ebfe22f14442f48ae109b2e1bb5fa3b
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Fixes: f5898bd93ff8 (flash/stm32fxx.c: do not read CPUID as this info is stored in cortex_m_common)
Reviewed-on: https://review.openocd.org/c/openocd/+/6752
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
src/flash/nor/stm32f1x.c
src/flash/nor/stm32f2x.c
src/flash/nor/stm32h7x.c
src/flash/nor/stm32l4x.c

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