Patch "tools/iio/iio_utils:fix memory leak" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    tools/iio/iio_utils:fix memory leak

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tools-iio-iio_utils-fix-memory-leak.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c94e6bf1595db170d5eedcf6e15e21b25bde363e
Author: Yulong Zhang <yulong.zhang@xxxxxxxxxx>
Date:   Tue Jan 17 10:51:47 2023 +0800

    tools/iio/iio_utils:fix memory leak
    
    [ Upstream commit f2edf0c819a4823cd6c288801ce737e8d4fcde06 ]
    
    1. fopen sysfs without fclose.
    2. asprintf filename without free.
    3. if asprintf return error,do not need to free the buffer.
    
    Signed-off-by: Yulong Zhang <yulong.zhang@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230117025147.69890-1-yulong.zhang@xxxxxxxxxx
    Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index 8d35893b2fa85..6a00a6eecaef0 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -264,6 +264,7 @@ int iioutils_get_param_float(float *output, const char *param_name,
 			if (fscanf(sysfsfp, "%f", output) != 1)
 				ret = errno ? -errno : -ENODATA;
 
+			fclose(sysfsfp);
 			break;
 		}
 error_free_filename:
@@ -345,9 +346,9 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 			}
 
 			sysfsfp = fopen(filename, "r");
+			free(filename);
 			if (!sysfsfp) {
 				ret = -errno;
-				free(filename);
 				goto error_close_dir;
 			}
 
@@ -357,7 +358,6 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 				if (fclose(sysfsfp))
 					perror("build_channel_array(): Failed to close file");
 
-				free(filename);
 				goto error_close_dir;
 			}
 			if (ret == 1)
@@ -365,11 +365,9 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 
 			if (fclose(sysfsfp)) {
 				ret = -errno;
-				free(filename);
 				goto error_close_dir;
 			}
 
-			free(filename);
 		}
 
 	*ci_array = malloc(sizeof(**ci_array) * (*counter));
@@ -395,9 +393,9 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 			}
 
 			sysfsfp = fopen(filename, "r");
+			free(filename);
 			if (!sysfsfp) {
 				ret = -errno;
-				free(filename);
 				count--;
 				goto error_cleanup_array;
 			}
@@ -405,20 +403,17 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 			errno = 0;
 			if (fscanf(sysfsfp, "%i", &current_enabled) != 1) {
 				ret = errno ? -errno : -ENODATA;
-				free(filename);
 				count--;
 				goto error_cleanup_array;
 			}
 
 			if (fclose(sysfsfp)) {
 				ret = -errno;
-				free(filename);
 				count--;
 				goto error_cleanup_array;
 			}
 
 			if (!current_enabled) {
-				free(filename);
 				count--;
 				continue;
 			}
@@ -429,7 +424,6 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 						strlen(ent->d_name) -
 						strlen("_en"));
 			if (!current->name) {
-				free(filename);
 				ret = -ENOMEM;
 				count--;
 				goto error_cleanup_array;
@@ -439,7 +433,6 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 			ret = iioutils_break_up_name(current->name,
 						     &current->generic_name);
 			if (ret) {
-				free(filename);
 				free(current->name);
 				count--;
 				goto error_cleanup_array;
@@ -450,17 +443,16 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 				       scan_el_dir,
 				       current->name);
 			if (ret < 0) {
-				free(filename);
 				ret = -ENOMEM;
 				goto error_cleanup_array;
 			}
 
 			sysfsfp = fopen(filename, "r");
+			free(filename);
 			if (!sysfsfp) {
 				ret = -errno;
-				fprintf(stderr, "failed to open %s\n",
-					filename);
-				free(filename);
+				fprintf(stderr, "failed to open %s/%s_index\n",
+					scan_el_dir, current->name);
 				goto error_cleanup_array;
 			}
 
@@ -470,17 +462,14 @@ int build_channel_array(const char *device_dir, int buffer_idx,
 				if (fclose(sysfsfp))
 					perror("build_channel_array(): Failed to close file");
 
-				free(filename);
 				goto error_cleanup_array;
 			}
 
 			if (fclose(sysfsfp)) {
 				ret = -errno;
-				free(filename);
 				goto error_cleanup_array;
 			}
 
-			free(filename);
 			/* Find the scale */
 			ret = iioutils_get_param_float(&current->scale,
 						       "scale",