From d1fc93b730cb7c51a85db07713272bb1dcaa11cd Mon Sep 17 00:00:00 2001 From: wang di Date: Thu, 27 Oct 2016 18:11:47 -0400 Subject: [PATCH] staging: lustre: llite: report back to user bad stripe count If the user is requesting a stripe count larger than what is supported in the file system then report back to the user an error as well as what is the largest possible striping. Signed-off-by: wang di Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6602 Reviewed-on: http://review.whamcloud.com/15162 Reviewed-by: Andreas Dilger Reviewed-by: James Simmons Reviewed-by: Oleg Drokin Signed-off-by: James Simmons Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lustre/llite/dir.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c index fb367ae..64a32d5 100644 --- a/drivers/staging/lustre/lustre/llite/dir.c +++ b/drivers/staging/lustre/lustre/llite/dir.c @@ -1195,6 +1195,7 @@ lmv_out_free: struct lmv_user_md *tmp = NULL; union lmv_mds_md *lmm = NULL; u64 valid = 0; + int max_stripe_count; int stripe_count; int mdt_index; int lum_size; @@ -1206,6 +1207,7 @@ lmv_out_free: if (copy_from_user(&lum, ulmv, sizeof(*ulmv))) return -EFAULT; + max_stripe_count = lum.lum_stripe_count; /* * lum_magic will indicate which stripe the ioctl will like * to get, LMV_MAGIC_V1 is for normal LMV stripe, LMV_USER_MAGIC @@ -1240,6 +1242,16 @@ lmv_out_free: } stripe_count = lmv_mds_md_stripe_count_get(lmm); + if (max_stripe_count < stripe_count) { + lum.lum_stripe_count = stripe_count; + if (copy_to_user(ulmv, &lum, sizeof(lum))) { + rc = -EFAULT; + goto finish_req; + } + rc = -E2BIG; + goto finish_req; + } + lum_size = lmv_user_md_size(stripe_count, LMV_MAGIC_V1); tmp = kzalloc(lum_size, GFP_NOFS); if (!tmp) { -- 2.7.4