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Code Issues Releases Wiki Activity

fbdev: hyperv_fb: fix uninitialized local variable use

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When CONFIG_SYSFB is disabled, the hyperv_fb driver can now run into
undefined behavior on a gen2 VM, as indicated by this smatch warning:

drivers/video/fbdev/hyperv_fb.c:1077 hvfb_getmem() error: uninitialized symbol 'base'.
drivers/video/fbdev/hyperv_fb.c:1077 hvfb_getmem() error: uninitialized symbol 'size'.

Since there is no way to know the actual framebuffer in this configuration,
just return an allocation failure here, which should avoid the build
warning and the undefined behavior.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202311070802.YCpvehaz-lkp@intel.com/
Fixes: a07b50d80a ("hyperv: avoid dependency on screen_info")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Arnd Bergmann 2023-11-08 15:58:13 +01:00 committed by Helge Deller
parent 2e2389ca5d
commit cca202a5e5
1 changed files with 2 additions and 0 deletions
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2
drivers/video/fbdev/hyperv_fb.c
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@ -1013,6 +1013,8 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
} else if (IS_ENABLED(CONFIG_SYSFB)) {
base = screen_info.lfb_base;
size = screen_info.lfb_size;
} else {
goto err1;
}
/*