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| author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-04-26 21:49:46 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-04-30 23:26:30 +0200 |
| commit | 081d5150845ba3fa49151a2f55d3cc03b0987509 (patch) | |
| tree | 682a9e7339b4a44db3b7f9ce223a333a041c88d7 | |
| parent | a088b858f16af85e3db359b6c6aaa92dd3bc0921 (diff) | |
| download | linux-081d5150845ba3fa49151a2f55d3cc03b0987509.tar.gz linux-081d5150845ba3fa49151a2f55d3cc03b0987509.tar.bz2 linux-081d5150845ba3fa49151a2f55d3cc03b0987509.zip | |
efi/libstub: Avoid returning uninitialized data from setup_graphics()
Currently, setup_graphics() ignores the return value of efi_setup_gop(). As
AllocatePool() does not zero out memory, the screen information table will
contain uninitialized data in this case.
We should free the screen information table if efi_setup_gop() returns an
error code.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Link: https://lore.kernel.org/r/20200426194946.112768-1-xypron.glpk@gmx.de
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
| -rw-r--r-- | drivers/firmware/efi/libstub/arm-stub.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c index 99a5cde7c2d8..48161b1dd098 100644 --- a/drivers/firmware/efi/libstub/arm-stub.c +++ b/drivers/firmware/efi/libstub/arm-stub.c @@ -60,7 +60,11 @@ static struct screen_info *setup_graphics(void) si = alloc_screen_info(); if (!si) return NULL; - efi_setup_gop(si, &gop_proto, size); + status = efi_setup_gop(si, &gop_proto, size); + if (status != EFI_SUCCESS) { + free_screen_info(si); + return NULL; + } } return si; } |