https://bugs.freedesktop.org/show_bug.cgi?id=99045
Bug ID: 99045
Summary: The string passed to sscanf() contains an
uninitialized value.
Product: DRI
Version: unspecified
Hardware: Other
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: libdrm
Assignee: dri-devel at lists.freedesktop.org
Reporter: archer_ame at yahoo.co.jp
Created attachment 128403
--> https://bugs.freedesktop.org/attachment.cgi?id=128403&action=edit
Patch to fix null termination.
The function drmParsePciBusInfo() in xf86drm.c reads the contents of the file
"/sys/dev/char/x:y/device/uevent" into the buffer.
The string written to the buffer by read() is not null-terminated, but this
function is writing null only at the end of the buffer.
As a result, the string passed to sscanf() contains an uninitialized value and
sscanf uses it.
For example,
The string that should be passed to sscanf().
"The contents of the file\0"
The string actually passed to sscanf().
"The contents of the file and uninitialized value until the end of the
buffer\0"
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