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video: fbdev: savage: fix memory leak on error handling path in probe

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savagefb_probe() calls savage_init_fb_info() that can successfully
allocate memory for info->pixmap.addr but then fail when
fb_alloc_cmap() fails. savagefb_probe() goes to label failed_init and
does not free allocated memory. It is not valid to go to label
failed_mmio since savage_init_fb_info() can fail during memory
allocation as well. So, the patch free allocated memory on the error
handling path in savage_init_fb_info() itself.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Cc: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200619162136.9010-1-novikov@ispras.ru
This commit is contained in:
Evgeny Novikov 2020-06-19 19:21:36 +03:00 committed by Bartlomiej Zolnierkiewicz
parent 17d8dcf533
commit e8d35898a7
1 changed files with 2 additions and 0 deletions
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2
drivers/video/fbdev/savage/savagefb_driver.c
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@ -2157,6 +2157,8 @@ static int savage_init_fb_info(struct fb_info *info, struct pci_dev *dev,
info->flags |= FBINFO_HWACCEL_COPYAREA |
FBINFO_HWACCEL_FILLRECT |
FBINFO_HWACCEL_IMAGEBLIT;
else
kfree(info->pixmap.addr);
}
#endif
return err;