Mikhail Dmitrichenko 8d25a89143 os: avoid potential out-of-bounds access at logVHdrMessageVerb ...

The LogVHdrMessageVerb function may access an array out of bounds in a
specific edge case. Specifically, the line:

newline = (buf[len - 1] == '\n');

can result in accessing buf[-1] if len == 0, which is undefined behavior.

Commit adds check to avoid access out of bounds at pointed line.

Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1841
Signed-off-by: Mikhail Dmitrichenko <m.dmitrichenko222@gmail.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2061>

2025-09-20 21:59:34 +00:00

..

.gitignore

…

access.c

os: unexport ClientIsLocal()

2025-02-18 10:53:44 +00:00

alloc.c

os: move alloc functions to separate source file

2024-02-29 10:09:37 +00:00

audit.h

os: unexport audit functions

2024-04-15 19:54:34 +00:00

auth.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

auth.h

os: unexport fields from opaque.h not used by modules / drivers

2024-06-23 21:19:27 +00:00

backtrace.c

Revert "os: log: replace ErrorFSigSafe() by ErrorF()"

2025-06-24 23:40:50 +00:00

busfault.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

busfault.h

os: fix missing include of misc.h in busfault.h

2024-04-16 14:19:59 +02:00

client_priv.h

Revert "os: unexport SetCriticalOutputPending()"

2025-06-24 11:23:14 -07:00

client.c

os: split off internal definitions from client.h

2024-10-10 13:45:29 +00:00

cmdline.h

os: unexport command line args handling functions

2024-04-15 21:21:40 +00:00

connection.c

Revert "os: unexport Os*() functions"

2025-07-20 12:41:06 -07:00

ddx_priv.h

os: unexport ddx callbacks

2024-05-08 09:37:35 +02:00

fmt.c

os: move out Format*() functions

2024-03-09 17:34:51 +00:00

fmt.h

misc.h: unexport compare_version()

2025-02-18 11:17:40 +00:00

inputthread.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

io.c

os: Check for integer overflow on BigRequest length

2025-06-18 11:40:54 +02:00

log.c

os: avoid potential out-of-bounds access at logVHdrMessageVerb

2025-09-20 21:59:34 +00:00

meson.build

os: move out LockServer logic from util.c to serverlock.c

2024-07-26 22:26:07 +00:00

mitauth.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

mitauth.h

os: move Auth* function types to separate header

2024-02-22 23:42:53 +00:00

osdep.h

Revert "os: move AbortServer() to os/utils.c"

2025-08-10 09:38:57 -07:00

osinit.c

Revert "os: unexport Os*() functions"

2025-07-20 12:41:06 -07:00

ospoll.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

ospoll.h

os: Add ospoll interface [v2]

2016-07-21 15:04:47 -04:00

reallocarray.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

screensaver.h

os: unexport screen saver timer functions

2024-09-01 20:23:10 +00:00

serverlock.c

os: move -nolock help message printing to serverlock.h

2024-07-26 22:26:07 +00:00

serverlock.h

os: move -nolock help message printing to serverlock.h

2024-07-26 22:26:07 +00:00

strcasecmp.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

strcasestr.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

string.c

os: move string functions to separate source file

2024-02-29 10:09:37 +00:00

strlcat.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

strlcpy.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

strndup.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

timingsafe_memcmp.c

timingsafe_memcmp: Fix meson build

2017-05-10 10:56:16 -04:00

utils.c

Revert "os: move AbortServer() to os/utils.c"

2025-08-10 09:38:57 -07:00

WaitFor.c

Revert "os: drop unused TimerCheck()"

2025-06-24 11:23:14 -07:00

xdmauth.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

xdmauth.h

os: move Auth* function types to separate header

2024-02-22 23:42:53 +00:00

xdmcp.c

os: if getaddrinfo() is available, use it, even if IPv6 support is disabled

2025-01-27 22:34:51 +00:00

xdmcp.h

Fix build with -Dxdmcp=false

2024-02-25 11:55:56 +01:00

xprintf.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

xserver_poll.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

xserver_poll.h

os: move xserver_poll.h into os/ directory

2024-06-21 00:53:39 +00:00

xsha1.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00

xsha1.h

include: move xsha1.h to os/

2024-03-03 23:11:05 +00:00

xstrans.c

drop obsolete HAVE_DIX_CONFIG_H

2024-10-10 13:38:31 +00:00