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From: David Marchand <david.marchand@redhat.com>
To: dev@dpdk.org
Cc: thomas@monjalon.net, Phil Yang <phil.yang@arm.com>,
	Lijian Zhang <lijian.zhang@arm.com>,
	Sunil Kumar Kori <skori@marvell.com>,
	Jerin Jacob <jerinj@marvell.com>
Subject: [dpdk-dev] [PATCH 8/8] trace: fix build with gcc 10
Date: Sun,  3 May 2020 22:31:35 +0200
Message-ID: <20200503203135.6493-9-david.marchand@redhat.com> (raw)
In-Reply-To: <20200503203135.6493-1-david.marchand@redhat.com>

From: Phil Yang <phil.yang@arm.com>

Prevent from writing beyond the allocated memory.

GCC 10 compiling output:
eal_common_trace_utils.c: In function 'eal_trace_dir_args_save':
eal_common_trace_utils.c:290:24: error: '__builtin___sprintf_chk'   \
	may write a terminating nul past the end of the destination \
	[-Werror=format-overflow=]
  290 |  sprintf(dir_path, "%s/", optarg);
      |                        ^

Fixes: 8af866df8d8c ("trace: add trace directory configuration parameter")

Signed-off-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Lijian Zhang <lijian.zhang@arm.com>
Tested-by: Lijian Zhang <lijian.zhang@arm.com>
Acked-by: Sunil Kumar Kori <skori@marvell.com>
Signed-off-by: David Marchand <david.marchand@redhat.com>
---
Changes since Phil patch:
- removed single-use 'size' variable,
- removed comment on PATH_MAX (this comment will get obsolete if
  trace->dir definition changes),
- asprintf return code is not used, no need to store,

---
 lib/librte_eal/common/eal_common_trace_utils.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_trace_utils.c b/lib/librte_eal/common/eal_common_trace_utils.c
index 49cc8d7b1d..988d7593e1 100644
--- a/lib/librte_eal/common/eal_common_trace_utils.c
+++ b/lib/librte_eal/common/eal_common_trace_utils.c
@@ -244,22 +244,19 @@ int
 eal_trace_dir_args_save(char const *val)
 {
 	struct trace *trace = trace_obj_get();
-	uint32_t size = sizeof(trace->dir);
-	char *dir_path = NULL;
+	char *dir_path;
 	int rc;
 
-	if (strlen(val) >= size) {
+	if (strlen(val) >= sizeof(trace->dir) - 1) {
 		trace_err("input string is too big");
 		return -ENAMETOOLONG;
 	}
 
-	dir_path = (char *)calloc(1, size);
-	if (dir_path == NULL) {
-		trace_err("fail to allocate memory");
+	if (asprintf(&dir_path, "%s/", val) == -1) {
+		trace_err("failed to copy directory: %s", strerror(errno));
 		return -ENOMEM;
 	}
 
-	sprintf(dir_path, "%s/", val);
 	rc = trace_dir_update(dir_path);
 
 	free(dir_path);
-- 
2.23.0


  parent reply	other threads:[~2020-05-03 20:33 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-03 20:31 [dpdk-dev] [PATCH 0/8] Traces cleanup for rc2 David Marchand
2020-05-03 20:31 ` [dpdk-dev] [PATCH 1/8] cryptodev: fix trace points registration David Marchand
2020-05-04  7:41   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-05-03 20:31 ` [dpdk-dev] [PATCH 2/8] trace: simplify trace point registration David Marchand
2020-05-04  2:46   ` Jerin Jacob
2020-05-04 14:02     ` Thomas Monjalon
2020-05-04 14:04     ` David Marchand
2020-05-04 14:39       ` Jerin Jacob
2020-05-04 17:08         ` David Marchand
2020-05-04 17:19           ` Jerin Jacob
2020-05-04 17:40             ` David Marchand
2020-05-04 17:54               ` Jerin Jacob
2020-05-04 21:31                 ` Thomas Monjalon
2020-05-05  3:43                   ` Jerin Jacob
2020-05-05  7:01                     ` Thomas Monjalon
2020-05-05  7:17                       ` Jerin Jacob
2020-05-05  7:24                         ` Thomas Monjalon
2020-05-05  7:33                           ` Jerin Jacob
2020-05-05  8:23                             ` David Marchand
2020-05-05 10:12                               ` Jerin Jacob
2020-05-05 10:26                                 ` Thomas Monjalon
2020-05-05 10:46                                   ` Jerin Jacob
2020-05-05 11:48                                     ` Olivier Matz
2020-05-05 11:35                                 ` David Marchand
2020-05-05 12:26                                   ` Jerin Jacob
2020-05-05 15:25                                     ` Jerin Jacob
2020-05-05 16:28                                       ` David Marchand
2020-05-05 16:46                                         ` Jerin Jacob
2020-05-05 16:58                                           ` Thomas Monjalon
2020-05-05 17:08                                             ` Jerin Jacob
2020-05-05 17:09                                               ` Jerin Jacob
2020-05-05 17:20                                                 ` Thomas Monjalon
2020-05-05 17:28                                                   ` Jerin Jacob
2020-05-05 20:10                                                     ` Thomas Monjalon
2020-05-06  6:11                                                       ` Jerin Jacob
2020-07-04 14:31   ` Jerin Jacob
2020-07-04 15:14   ` [dpdk-dev] [PATCH v2] " David Marchand
2020-07-05 19:41     ` Thomas Monjalon
2020-05-03 20:31 ` [dpdk-dev] [PATCH 3/8] trace: simplify trace point headers David Marchand
2020-05-04  6:12   ` Jerin Jacob
2020-05-03 20:31 ` [dpdk-dev] [PATCH 4/8] trace: avoid confusion on optarg David Marchand
2020-05-04  7:55   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-05-04 14:09     ` David Marchand
2020-05-05  5:45       ` Sunil Kumar Kori
2020-05-05  5:47         ` Sunil Kumar Kori
2020-05-03 20:31 ` [dpdk-dev] [PATCH 5/8] trace: remove unneeded checks in internal API David Marchand
2020-05-04  8:16   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-05-03 20:31 ` [dpdk-dev] [PATCH 6/8] trace: remove limitation on patterns number David Marchand
2020-05-04  8:48   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-05-04 14:14     ` David Marchand
2020-05-05  5:54       ` Sunil Kumar Kori
2020-05-03 20:31 ` [dpdk-dev] [PATCH 7/8] trace: remove string duplication David Marchand
2020-05-04  9:01   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-05-03 20:31 ` David Marchand [this message]
2020-05-06 13:06 ` [dpdk-dev] [PATCH 0/8] Traces cleanup for rc2 David Marchand

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