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Solve compress lead mem leak #666

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Solve compress lead mem leak #666

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5653550
Update dlt_offline_logstorage.c
hush-soul Jul 17, 2024
1124dd9
Update dlt_offline_logstorage_behavior.c
hush-soul Jul 17, 2024
f80373d
Update dlt_offline_logstorage_behavior.c
hush-soul Jul 17, 2024
208c99e
Update dlt_offline_logstorage_behavior.c
hush-soul Jul 17, 2024
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6 changes: 4 additions & 2 deletions src/offlinelogstorage/dlt_offline_logstorage.c
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Original file line number Diff line number Diff line change
Expand Up @@ -80,14 +80,16 @@ DLT_STATIC void dlt_logstorage_filter_config_free(DltLogStorageFilterConfig *dat
data->ecuid = NULL;
}

if (data->log != NULL)
fclose(data->log);

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Could you explain a little bit why we move the code here to other lines?
Is there any reasons for closing the gzip first and then close the log?

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Yes, the order of opening is fopen gzipopen, so I think the order of closing is best gzclose, fclose


#ifdef DLT_LOGSTORAGE_USE_GZIP
if (data->gzlog != NULL)
gzclose(data->gzlog);
#endif

if (data->log != NULL)
fclose(data->log);

if (data->cache != NULL) {
free(data->cache);
data->cache = NULL;
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12 changes: 10 additions & 2 deletions src/offlinelogstorage/dlt_offline_logstorage_behavior.c
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Expand Up @@ -371,13 +371,15 @@ int dlt_logstorage_storage_dir_info(DltLogStorageUserConfig *file_config,
}

char* suffix = NULL;
for (i = 0; i < cnt; i++) {
if (config->gzip_compression) {
if (config->gzip_compression) {
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I think allocating the suffix here multiple times in the loops was the only cause for the memory leak. Or is there another memleak fixed in this PR?

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Thank you, I will test this case separately when I have time to see if it matches the guess

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I think allocating the suffix here multiple times in the loops was the only cause for the memory leak. Or is there another memleak fixed in this PR?

After testing, it was found that there are two main reasons for memory leaks: 1. fclose needs to be added 2.Allocate memory in a loop

suffix = strdup(".dlt.gz");
}
else {
suffix = strdup(".dlt");
}

for (i = 0; i < cnt; i++) {

int len = 0;
len = strlen(file_name);
Expand Down Expand Up @@ -501,6 +503,7 @@ DLT_STATIC void dlt_logstorage_open_log_output_file(DltLogStorageFilterConfig *c
#ifdef DLT_LOGSTORAGE_USE_GZIP
dlt_vlog(LOG_DEBUG, "%s: Opening GZIP log file\n", __func__);
config->gzlog = gzdopen(config->fd, mode);
config->log = file;
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there should be no need to store config->log here. As per my understanding gzclose() will close the passed fd from gzdopen()

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According to my tests, after gzclose, fclose is also needed. This part of the test is included in #655

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@michael-methner
I did a test to remove fclose, and the results are as follows: fclose is necessary, and the currently submitted code is necessary.

add fclose
add fclose

delete fclose
delete_flocse

#endif
} else {
dlt_vlog(LOG_DEBUG, "%s: Opening log file\n", __func__);
Expand Down Expand Up @@ -912,6 +915,11 @@ DLT_STATIC void dlt_logstorage_close_file(DltLogStorageFilterConfig *config)
gzclose(config->gzlog);
config->gzlog = NULL;
}

if (config->log) {
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fclose(config->log);
config->log = NULL;
}
#endif
if (config->log) {
fclose(config->log);
Expand Down