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Srish Srinivasan fa93f2412b kern/command,commands/extcmd: Perform explicit NULL check in both the unregister helpers 
During command registration, grub_register_command_prio() returns
a 0 when there is a failure in memory allocation. In such a situation,
calls to grub_unregister_{command(), extcmd()} during command
unregistration will result in dereferencing a NULL pointer.

Perform explicit NULL check in both unregister helpers to prevent
undefined behaviour due to a NULL pointer dereference.

Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2025-10-11 15:36:54 +02:00
..
appendedsig
appended signatures: GRUB commands to manage the hashes
2025-10-11 15:36:53 +02:00
arc
Remove nested functions from device iterators.
2013-01-20 15:52:15 +00:00
efi
commands/efi/tpm: Call get_active_pcr_banks() only with TCG2 1.1 or newer
2025-10-11 15:36:54 +02:00
i386
i386/msr: Extract and improve MSR support detection code
2024-10-10 13:09:06 +02:00
ieee1275
ieee1275/tcg2: Refactor grub_ieee1275_tpm_init()
2024-11-28 22:37:50 +01:00
mips/loongson
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
tpm2_key_protector
tpm2_key_protector: Dump the PCR bank for key unsealing
2025-06-17 14:12:50 +02:00
xen
Correct some translatable strings.
2013-12-21 03:03:31 +01:00
acpi.c
commands/acpi: Use options enum to index command options
2025-03-05 21:24:47 +01:00
acpihalt.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
bli.c
commands/bli: Set LoaderTpm2ActivePcrBanks runtime variable
2025-08-14 21:20:01 +02:00
blocklist.c
disk: Allow read hook callback to take read buffer to potentially modify it
2022-07-04 14:43:25 +02:00
blsuki.c
blsuki: Add uki command to load Unified Kernel Image entries
2025-09-04 14:37:20 +02:00
boot.c
commands/boot: Add API to pass context to loader
2022-06-07 16:39:31 +02:00
boottime.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
cacheinfo.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
cat.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
cmp.c
commands/cmp: Only return success when both files have the same contents
2023-01-10 16:32:42 +01:00
configfile.c
* grub-core/commands/configfile.c (GRUB_MOD_INIT): Correct
2012-10-12 15:34:33 +01:00
date.c
misc: Make grub_strtol() "end" pointers have safer const qualifiers
2020-02-28 12:41:29 +01:00
echo.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
eval.c
* grub-core/script/execute.c (grub_script_execute_sourcecode): Split
2013-06-07 18:40:37 +02:00
extcmd.c
kern/command,commands/extcmd: Perform explicit NULL check in both the unregister helpers
2025-10-11 15:36:54 +02:00
file32.c
Implement grub_file tool and use it to implement generating of config
2013-12-17 14:39:48 +01:00
file64.c
Implement grub_file tool and use it to implement generating of config
2013-12-17 14:39:48 +01:00
file.c
commands/file: Fix NULL dereference in the knetbsd tests
2025-02-26 19:34:57 +01:00
fileXX.c
commands/fileXX: Fix remaining memory leak.
2015-01-25 16:36:30 +03:00
gptsync.c
gptsync: Add missing device_close.
2015-01-24 20:52:02 +01:00
halt.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
hashsum.c
libgcrypt: Adjust import script, definitions and API users for libgcrypt 1.11
2025-07-11 23:12:50 +02:00
hdparm.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
help.c
normal/help: Add paging instructions to normal and help prompts
2022-11-14 17:37:51 +01:00
hexdump.c
commands/hexdump: Disable memory reading in lockdown mode
2025-02-13 15:45:56 +01:00
iorw.c
efi: Use grub_is_lockdown() instead of hardcoding a disabled modules list
2021-03-02 15:54:15 +01:00
keylayouts.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
keystatus.c
kern/term: Make grub_getkeystatus() helper function available everywhere
2020-04-21 22:08:52 +02:00
legacycfg.c
blsuki: Add blscfg command to parse Boot Loader Specification snippets
2025-09-04 14:37:20 +02:00
loadenv.c
disk: Allow read hook callback to take read buffer to potentially modify it
2022-07-04 14:43:25 +02:00
ls.c
commands/ls: Add directory header for dir args
2025-03-05 21:24:48 +01:00
lsacpi.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
lsmmap.c
Translate UEFI persistent memory type
2015-12-15 10:25:34 +03:00
lspci.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
macbless.c
commands/macbless: Remove whitespace between N_ macro and open parenthesis
2022-06-07 12:51:50 +02:00
memrw.c
commands/memrw: Disable memory reading in lockdown mode
2025-02-13 15:45:56 +01:00
memtools.c
commands/memtools: Add memtool module with memory allocation stress-test
2023-03-07 15:26:36 +01:00
menuentry.c
blsuki: Add blscfg command to parse Boot Loader Specification snippets
2025-09-04 14:37:20 +02:00
minicmd.c
disk/cryptodisk: Add the "erase secrets" function
2025-05-06 17:14:03 +02:00
nativedisk.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
parttool.c
types: Make bool generally available
2022-11-14 17:17:21 +01:00
password_pbkdf2.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
password.c
Improve gettext support. Stylistic fixes and error handling fixes while
2012-02-08 19:26:01 +01:00
pcidump.c
misc: Make grub_strtol() "end" pointers have safer const qualifiers
2020-02-28 12:41:29 +01:00
pgp.c
pgp: Rename OBJ_TYPE_PUBKEY to OBJ_TYPE_GPG_PUBKEY
2025-10-11 15:36:34 +02:00
probe.c
guid: Make use of GUID printf format specifier
2023-06-01 11:45:00 +02:00
read.c
commands/read: Fix an integer overflow when supplying more than 2^31 characters
2025-02-13 15:45:56 +01:00
reboot.c
Add noreturn attributes and remove unreachable code.
2011-12-13 15:13:51 +01:00
regexp.c
commands/regexp: Fix typo
2023-07-03 14:10:01 +02:00
search_file.c
* grub-core/commands/search_file.c (SEARCH_TARGET): Remove obsolete
2012-02-03 11:46:18 +01:00
search_label.c
* grub-core/commands/search_file.c (SEARCH_TARGET): Remove obsolete
2012-02-03 11:46:18 +01:00
search_uuid.c
* grub-core/commands/search_file.c (SEARCH_TARGET): Remove obsolete
2012-02-03 11:46:18 +01:00
search_wrap.c
commands/search: Introduce the --cryptodisk-only argument
2025-05-06 17:14:02 +02:00
search.c
cryptocheck: Add --quiet option
2025-05-06 17:14:04 +02:00
setpci.c
commands/setpci: Honor write mask argument
2021-09-06 15:08:23 +02:00
sleep.c
kern/term: Accept ESC, F4 and holding SHIFT as user interrupt keys
2020-04-21 22:13:44 +02:00
smbios.c
smbios: Add a --linux argument to apply linux modalias-like filtering
2020-03-10 21:35:02 +01:00
syslinuxcfg.c
commands/syslinux: Add missing free.
2015-01-24 21:23:25 +01:00
terminal.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
test.c
commands/test: Stack overflow due to unlimited recursion depth
2025-02-13 15:45:56 +01:00
testload.c
disk: Allow read hook callback to take read buffer to potentially modify it
2022-07-04 14:43:25 +02:00
testspeed.c
verifiers: File type for fine-grained signature-verification controlling
2018-11-09 13:25:31 +01:00
time.c
Improve string. Gettextize.
2012-02-12 15:25:25 +01:00
tpm.c
commands/tpm: Skip loopback image measurement
2024-10-10 13:04:37 +02:00
tr.c
commands/tr: Simplify and fix missing parameter test.
2015-01-24 21:25:42 +01:00
true.c
* grub-core/commands/acpihalt.c: Add TRANSLATORS comments.
2012-03-03 12:59:28 +01:00
usbtest.c
usbtest: Disable gcc9 -Waddress-of-packed-member
2019-04-23 11:37:08 +02:00
videoinfo.c
commands/videoinfo: Prevent crash when run while video driver already active
2023-08-14 18:04:04 +02:00
videotest.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
wildcard.c
commands: Remove trailing whitespaces
2022-03-14 15:44:26 +01:00
xnu_uuid.c
libgcrypt: Adjust import script, definitions and API users for libgcrypt 1.11
2025-07-11 23:12:50 +02:00