[Accel-config] [PATCH] accel-config: Fix a read buffer length bug

Generic function used to read a string attribute was using a buffer of
max length 64. Attributes like op_cap exceeds that size. Change read
buffer length to 128. Also removed a redundant memory allocation.

Signed-off-by: Ramesh Thomas <ramesh.thomas(a)intel.com>
---
 accfg/lib/libaccfg.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/accfg/lib/libaccfg.c b/accfg/lib/libaccfg.c
index 9cdd8f8..f20706c 100644
--- a/accfg/lib/libaccfg.c
+++ b/accfg/lib/libaccfg.c
@@ -247,13 +247,13 @@ static uint64_t accfg_get_param_unsigned_llong(
 static char *accfg_get_param_str(struct accfg_ctx *ctx, int dfd, char *name)
 {
 	int fd = openat(dfd, name, O_RDONLY);
-	char buf[MAX_PARAM_LEN + 1];
+	char buf[MAX_BUF_LEN + 1];
 	int n;
 
 	if (fd == -1)
 		return NULL;
 
-	n = read(fd, buf, MAX_PARAM_LEN);
+	n = read(fd, buf, MAX_BUF_LEN);
 	close(fd);
 	if (n <= 0)
 		return NULL;
@@ -618,21 +618,13 @@ static void *add_device(void *parent, int id, const char *ctl_base,
 {
 	struct accfg_ctx *ctx = parent;
 	struct accfg_device *device;
-	char *path;
 	int dfd;
 	int rc;
 	char *p;
 
-	path = calloc(1, strlen(ctl_base) + MAX_PARAM_LEN);
-	if (!path) {
-		err(ctx, "%s: allocation of path failed\n", __func__);
-		return NULL;
-	}
-
 	dfd = open(ctl_base, O_PATH);
 	if (dfd == -1) {
 		err(ctx, "%s open failed: %s\n", __func__, strerror(errno));
-		free(path);
 		return NULL;
 	}
 
@@ -720,7 +712,6 @@ static void *add_device(void *parent, int id, const char *ctl_base,
 		goto err_dev_path;
 
 	list_add_tail(&ctx->devices, &device->list);
-	free(path);
 
 	return device;
 
@@ -730,7 +721,6 @@ err_read:
 	free(device->mdev_path);
 	free(device);
 err_device:
-	free(path);
 	return NULL;
 }
 
-- 
2.34.1