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| author | Kangjie Lu <kjlu@umn.edu> | 2019-04-01 18:46:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-15 12:53:04 +0300 |
| commit | 317cc03af259accb428eb28c63619c3ff195f0d7 (patch) | |
| tree | 15f6485f89c27f44964be28666631c656d165e24 /drivers/video | |
| parent | 15337c4e4e86bf850335552e55262c24dc5fdb7e (diff) | |
| download | linux-317cc03af259accb428eb28c63619c3ff195f0d7.tar.xz | |
video: hgafb: fix potential NULL pointer dereference
[ Upstream commit ec7f6aad57ad29e4e66cc2e18e1e1599ddb02542 ]
When ioremap fails, hga_vram should not be dereferenced. The fix
check the failure to avoid NULL pointer dereference.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Cc: Aditya Pakki <pakki001@umn.edu>
Cc: Ferenc Bakonyi <fero@drama.obuda.kando.hu>
[b.zolnierkie: minor patch summary fixup]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/hgafb.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/video/fbdev/hgafb.c b/drivers/video/fbdev/hgafb.c index 463028543173..59e1cae57948 100644 --- a/drivers/video/fbdev/hgafb.c +++ b/drivers/video/fbdev/hgafb.c @@ -285,6 +285,8 @@ static int hga_card_detect(void) hga_vram_len = 0x08000; hga_vram = ioremap(0xb0000, hga_vram_len); + if (!hga_vram) + goto error; if (request_region(0x3b0, 12, "hgafb")) release_io_ports = 1; |