[8/8] trace: fix build with gcc 10
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Commit Message
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(-)
@@ -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);