From: Logan Gunthorpe Date: Mon, 20 Jun 2016 19:15:08 +0000 (-0600) Subject: ntb_tool: BUG: Ensure the buffer size is large enough to return all spads X-Git-Tag: v5.15~13080^2~15 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=625f0802e84e47760959a5015fdc704d809fd6c8;p=mirror_ubuntu-kernels.git ntb_tool: BUG: Ensure the buffer size is large enough to return all spads On hardware with 32 scratchpad registers the spad field in ntb tool could chop off the end. The maximum buffer size is increased from 256 to 15 times the number or scratchpads. Signed-off-by: Logan Gunthorpe Acked-by: Allen Hubbe Signed-off-by: Jon Mason --- diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c index 209ef7ceb98a..a0ead31cd799 100644 --- a/drivers/ntb/test/ntb_tool.c +++ b/drivers/ntb/test/ntb_tool.c @@ -239,7 +239,14 @@ static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf, if (!spad_read_fn) return -EINVAL; - buf_size = min_t(size_t, size, 0x100); + spad_count = ntb_spad_count(tc->ntb); + + /* + * We multiply the number of spads by 15 to get the buffer size + * this is from 3 for the %d, 10 for the largest hex value + * (0x00000000) and 2 for the tab and line feed. + */ + buf_size = min_t(size_t, size, spad_count * 15); buf = kmalloc(buf_size, GFP_KERNEL); if (!buf) @@ -247,7 +254,6 @@ static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf, pos = 0; - spad_count = ntb_spad_count(tc->ntb); for (i = 0; i < spad_count; ++i) { pos += scnprintf(buf + pos, buf_size - pos, "%d\t%#x\n", i, spad_read_fn(tc->ntb, i));