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Deallocate runzip structures after all runzip chunks are complete to avoid a race in the case of a failed chunk decompressing.

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This commit is contained in:
Con Kolivas 2021-02-15 15:20:12 +11:00
parent 2c7c4832b3
commit be884d09e0
3 changed files with 48 additions and 4 deletions
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8
lrzip_private.h
View file

@ -356,6 +356,12 @@ struct node {
struct node *prev;
};
struct runzip_node {
struct stream_info *sinfo;
pthread_t *pthreads;
struct runzip_node *prev;
};
struct rzip_state {
void *ss;
struct node *sslist;
@ -468,6 +474,8 @@ struct rzip_control {
i64 (*match_len)(rzip_control *, struct rzip_state *, i64, i64, i64, i64 *);
pthread_t *pthreads;
struct runzip_node *rulist;
struct runzip_node *ruhead;
};
struct uncomp_thread {

19
runzip.c
View file

@ -246,6 +246,21 @@ static i64 unzip_match(rzip_control *control, void *ss, i64 len, uint32 *cksum,
return total;
}
static void clear_rulist(rzip_control *control)
{
while (control->ruhead) {
struct runzip_node *node = control->ruhead;
struct stream_info *sinfo = node->sinfo;
dealloc(sinfo->ucthreads);
dealloc(node->pthreads);
dealloc(sinfo->s);
dealloc(sinfo);
control->ruhead = node->prev;
dealloc(node);
}
}
/* decompress a section of an open file. Call fatal_return(() on error
return the number of bytes that have been retrieved
*/
@ -363,6 +378,10 @@ static i64 runzip_chunk(rzip_control *control, int fd_in, i64 expected_size, i64
if (unlikely(close_stream_in(control, ss)))
fatal("Failed to close stream!\n");
/* We can now safely delete sinfo and pthread data of all threads
* created. */
clear_rulist(control);
return total;
}

25
stream.c
View file

@ -1085,6 +1085,8 @@ void *open_stream_in(rzip_control *control, int f, int n, char chunk_bytes)
sinfo->s = calloc(sizeof(struct stream), n);
if (unlikely(!sinfo->s)) {
dealloc(sinfo);
dealloc(threads);
dealloc(ucthreads);
return NULL;
}
@ -1206,6 +1208,8 @@ again:
failed:
dealloc(sinfo->s);
dealloc(sinfo);
dealloc(threads);
dealloc(ucthreads);
return NULL;
}
@ -1818,6 +1822,20 @@ int close_stream_out(rzip_control *control, void *ss)
return 0;
}
/* Add to an runzip list to safely deallocate memory after all threads have
* returned. */
static void add_to_rulist(rzip_control *control, struct stream_info *sinfo)
{
struct runzip_node *node = calloc(sizeof(struct runzip_node), 1);
if (unlikely(!node))
failure("Failed to calloc struct node in add_rulist\n");
node->sinfo = sinfo;
node->pthreads = control->pthreads;
node->prev = control->rulist;
control->ruhead = node;
}
/* close down an input stream */
int close_stream_in(rzip_control *control, void *ss)
{
@ -1834,10 +1852,9 @@ int close_stream_in(rzip_control *control, void *ss)
dealloc(sinfo->s[i].buf);
output_thread = 0;
dealloc(sinfo->ucthreads);
dealloc(control->pthreads);
dealloc(sinfo->s);
dealloc(sinfo);
/* We cannot safely release the sinfo and pthread data here till all
* threads are shut down. */
add_to_rulist(control, sinfo);
return 0;
}