[PATCH 4.9 18/86] MIPS: ath25: Check for kzalloc allocation failure

From: Greg Kroah-Hartman
Date: Fri Mar 16 2018 - 13:18:20 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # 3.19+
Patchwork: https://patchwork.linux-mips.org/patch/18657/
Signed-off-by: James Hogan <jhogan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/mips/ath25/board.c | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/mips/ath25/board.c
+++ b/arch/mips/ath25/board.c
@@ -135,6 +135,8 @@ int __init ath25_find_config(phys_addr_t
}

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) {