From: Colin Ian King Date: Mon, 7 Dec 2020 14:54:46 +0000 (+0000) Subject: block/rnbd: fix a null pointer dereference on dev->blk_symlink_name X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~491^2~378 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=aa4f552aec3d43cc1455490825399d178da0a65f;p=linux.git block/rnbd: fix a null pointer dereference on dev->blk_symlink_name [ Upstream commit 733c15bd3a944b8eeaacdddf061759b6a83dd3f4 ] Currently in the case where dev->blk_symlink_name fails to be allocates the error return path attempts to set an end-of-string character to the unallocated dev->blk_symlink_name causing a null pointer dereference error. Fix this by returning with an explicity ENOMEM error (which also is missing in the original code as was not initialized). Fixes: 1eb54f8f5dd8 ("block/rnbd: client: sysfs interface functions") Signed-off-by: Colin Ian King Addresses-Coverity: ("Dereference after null check") Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- diff --git a/drivers/block/rnbd/rnbd-clt-sysfs.c b/drivers/block/rnbd/rnbd-clt-sysfs.c index b53df40c9a97..d854f057056b 100644 --- a/drivers/block/rnbd/rnbd-clt-sysfs.c +++ b/drivers/block/rnbd/rnbd-clt-sysfs.c @@ -494,7 +494,7 @@ static int rnbd_clt_add_dev_symlink(struct rnbd_clt_dev *dev) dev->blk_symlink_name = kzalloc(len, GFP_KERNEL); if (!dev->blk_symlink_name) { rnbd_clt_err(dev, "Failed to allocate memory for blk_symlink_name\n"); - goto out_err; + return -ENOMEM; } ret = rnbd_clt_get_path_name(dev, dev->blk_symlink_name,