Re: [syzbot] [dri?] [usb?] KASAN: slab-out-of-bounds Read in drm_property_add_enum

[syzbot]

Hello,

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

lost connection to test machine



Warning: Permanently added '[localhost]:25442' (ED25519) to the list of known hosts.
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0xb4000)
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x24e000)
[   81.081183][ T1126] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1
[   81.083507][ T1126] ata1: failed to read log page 10h (errno=-5)
[   81.085637][ T1126] ata1.00: NCQ disabled due to excessive errors
[   81.087924][ T1126] ata1.00: exception Emask 0x1 SAct 0x4000c000 SErr 0x0 action 0x0
[   81.090893][ T1126] ata1.00: irq_stat 0x40000000
[   81.092585][ T1126] ata1.00: failed command: WRITE FPDMA QUEUED
[   81.094722][ T1126] ata1.00: cmd 61/70:70:3e:2a:05/12:00:00:00:00/40 tag 14 ncq dma 2416640 ou
[   81.094722][ T1126]          res 50/04:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   81.101073][ T1126] ata1.00: status: { DRDY }
[   81.102622][ T1126] ata1.00: error: { ABRT }
[   81.104309][ T1126] ata1.00: failed command: WRITE FPDMA QUEUED
[   81.106364][ T1126] ata1.00: cmd 61/88:78:ae:3c:05/04:00:00:00:00/40 tag 15 ncq dma 593920 out
[   81.106364][ T1126]          res 50/04:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   81.113344][ T1126] ata1.00: status: { DRDY }
[   81.114997][ T1126] ata1.00: error: { ABRT }
[   81.116646][ T1126] ata1.00: failed command: WRITE FPDMA QUEUED
[   81.119040][ T1126] ata1.00: cmd 61/a0:f0:66:72:04/05:00:00:00:00/40 tag 30 ncq dma 737280 out
[   81.119040][ T1126]          res 50/04:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[   81.126410][ T1126] ata1.00: status: { DRDY }
[   81.128352][ T1126] ata1.00: error: { ABRT }
[   81.131274][ T1126] ata1.00: configured for UDMA/100
[   81.134138][ T1126] ata1: EH complete
qemu-system-x86_64: hw/ide/core.c:934: ide_dma_cb: Assertion `prep_size >= 0 && prep_size <= n * 512' failed.
Connection to localhost closed by remote host.


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2753574219=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 746171eef8d
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=746171eef8d3611ed06d1a92ef68d5bee5031150 -X github.com/google/syzkaller/prog.gitRevisionDate=20260814-132435"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=746171eef8d3611ed06d1a92ef68d5bee5031150 -X github.com/google/syzkaller/prog.gitRevisionDate=20260814-132435"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=746171eef8d3611ed06d1a92ef68d5bee5031150 -X github.com/google/syzkaller/prog.gitRevisionDate=20260814-132435"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_386
x86_64-linux-gnu-g++ -o ./bin/linux_386/syz-executor executor/executor.cc \
	-m32 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_386=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"746171eef8d3611ed06d1a92ef68d5bee5031150\"
/usr/bin/ld: /tmp/ccoTJTt1.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x145): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
[INFO] Unsupported architecture '386', skipping check.



Tested on:

commit:         0d5a4a96 drm/gud: validate TV mode names before creati..
git tree:       https://github.com/yutao-intel/linux.git fix-dri
kernel config:  https://syzkaller.appspot.com/x/.config?x=e4131490469a78a3
dashboard link: https://syzkaller.appspot.com/bug?extid=9ae8e7884e451eaed5b4
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386

Note: no patches were applied.