linux-kernel - Re: [syzbot] [ext4?] KASAN: use-after-free Read in __ext4_check_dir

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Date: Wed, 26 Jun 2024 01:10:03 -0700
From: syzbot <syzbot+11af34d3c0711f233fd4@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, norbert.kaminski@...ogain.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] KASAN: use-after-free Read in
 __ext4_check_dir_entry (2)

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

scripts/extract-cert.c:46:9: warning: 'ERR_get_error_line' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
scripts/extract-cert.c:59:9: warning: 'ERR_get_error_line' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
scripts/sign-file.c:89:9: warning: 'ERR_get_error_line' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
scripts/sign-file.c:102:9: warning: 'ERR_get_error_line' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
orc_dump.c:106:9: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
orc_dump.c:111:9: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
elf.c:135:9: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:140:9: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free]
subcmd-util.h:58:31: error: pointer may be used after 'realloc' [-Werror=use-after-free]


Tested on:

commit:         e40ff213 ext4: force revalidation of directory pointer..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=9d7ea7de0cb32587
dashboard link: https://syzkaller.appspot.com/bug?extid=11af34d3c0711f233fd4
compiler:       Debian clang version 15.0.6

Note: no patches were applied.