[dpdk-dev] [PATCH 1/2] app/testpmd: fix stack overwriting by flow command

[Adrien Mazarguil <adrien.mazarguil@6wind.com>]

The parameter type parser function stores a stack-local address in the
global parser context when parsing a "prefix" keyword.

This usually translates to "Bad arguments" errors even for correct flow
rules as stack gets overwritten by subsequent function calls.

Fixes: d3f61b7bad20 ("app/testpmd: add flow item spec prefix length")

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 app/test-pmd/cmdline_flow.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 0a40005..e952c91 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -1808,6 +1808,8 @@ parse_vc_spec(struct context *ctx, const struct token *token,
 		return -1;
 	/* Parse parameter types. */
 	switch (ctx->curr) {
+		static const enum index prefix[] = NEXT_ENTRY(PREFIX);
+
 	case ITEM_PARAM_IS:
 		index = 0;
 		objmask = 1;
@@ -1822,7 +1824,7 @@ parse_vc_spec(struct context *ctx, const struct token *token,
 		/* Modify next token to expect a prefix. */
 		if (ctx->next_num < 2)
 			return -1;
-		ctx->next[ctx->next_num - 2] = NEXT_ENTRY(PREFIX);
+		ctx->next[ctx->next_num - 2] = prefix;
 		/* Fall through. */
 	case ITEM_PARAM_MASK:
 		index = 2;
-- 
2.1.4