MIPS: ath25: Check for kzalloc allocation failure

commit 1b22b4b28fd5fbc51855219e3238b3ab81da8466 upstream.

Currently there is no null check on a failed allocation of board_data,
and hence a null pointer dereference will occurr. Fix this by checking
for the out of memory null pointer.

Fixes: a7473717483e ("MIPS: ath25: add board configuration detection")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 3.19+
Patchwork: https://patchwork.linux-mips.org/patch/18657/
Signed-off-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/mips/ath25/board.c b/arch/mips/ath25/board.c
index 9ab48ff80c1c8de3a5de0050e2d4d5f22dc0c773..6d11ae581ea775bc2e919e16bdd63cdb6b06d86f 100644 (file)
--- a/arch/mips/ath25/board.c
+++ b/arch/mips/ath25/board.c
@@ -135,6 +135,8 @@ int __init ath25_find_config(phys_addr_t base, unsigned long size)
        }
 
        board_data = kzalloc(BOARD_CONFIG_BUFSZ, GFP_KERNEL);
+       if (!board_data)
+               goto error;
        ath25_board.config = (struct ath25_boarddata *)board_data;
        memcpy_fromio(board_data, bcfg, 0x100);
        if (broken_boarddata) {