[dpdk-dev] [PATCH] cfgfile: fix uninitialized variable on load error

[dpdk-dev] [PATCH] cfgfile: fix uninitialized variable on load error

[Dmitriy Yakovlev]

Uninitialized scalar variable. Using uninitialized value cfg->sections[curr_section]->num_entries when calling rte_cfgfile_close.
And memory in variables cfg->sections[curr_section], sect->entries[curr_entry] maybe not equal NULL. We must decrement counters curr_section, curr_entry when failed to realloc.

Fixes: eaafbad419bf ("cfgfile: library to interpret config files")

Signed-off-by: Dmitriy Yakovlev <bombermag@gmail.com>
---
 lib/librte_cfgfile/rte_cfgfile.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/librte_cfgfile/rte_cfgfile.c b/lib/librte_cfgfile/rte_cfgfile.c
index d72052a..829109a 100644
--- a/lib/librte_cfgfile/rte_cfgfile.c
+++ b/lib/librte_cfgfile/rte_cfgfile.c
@@ -151,6 +151,7 @@ struct rte_cfgfile *
 					sizeof(*cfg) + sizeof(cfg->sections[0])
 					* allocated_sections);
 				if (n_cfg == NULL) {
+					curr_section--;
 					printf("Error - no more memory\n");
 					goto error1;
 				}
@@ -198,6 +199,7 @@ struct rte_cfgfile *
 					sizeof(sect->entries[0]) *
 					allocated_entries);
 				if (n_sect == NULL) {
+					curr_entry--;
 					printf("Error - no more memory\n");
 					goto error1;
 				}
@@ -233,6 +235,8 @@ struct rte_cfgfile *
 
 error1:
 	cfg->num_sections = curr_section + 1;
+	if (curr_section >= 0)
+		cfg->sections[curr_section]->num_entries = curr_entry + 1;
 	rte_cfgfile_close(cfg);
 error2:
 	fclose(f);
-- 
1.9.1

Re: [dpdk-dev] [PATCH] cfgfile: fix uninitialized variable on load error

[Thomas Monjalon]

Ping Cristian

2017-02-07 05:51, Dmitriy Yakovlev:
> Uninitialized scalar variable. Using uninitialized value cfg->sections[curr_section]->num_entries when calling rte_cfgfile_close.
> And memory in variables cfg->sections[curr_section], sect->entries[curr_entry] maybe not equal NULL. We must decrement counters curr_section, curr_entry when failed to realloc.
> 
> Fixes: eaafbad419bf ("cfgfile: library to interpret config files")
> 
> Signed-off-by: Dmitriy Yakovlev <bombermag@gmail.com>

Re: [dpdk-dev] [PATCH] cfgfile: fix uninitialized variable on load error

[Dumitrescu, Cristian]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Dmitriy Yakovlev
> Sent: Tuesday, February 7, 2017 2:51 AM
> To: dev@dpdk.org
> Cc: Dmitriy Yakovlev <bombermag@gmail.com>
> Subject: [dpdk-dev] [PATCH] cfgfile: fix uninitialized variable on load error
> 
> Uninitialized scalar variable. Using uninitialized value cfg-
> >sections[curr_section]->num_entries when calling rte_cfgfile_close.
> And memory in variables cfg->sections[curr_section], sect-
> >entries[curr_entry] maybe not equal NULL. We must decrement counters
> curr_section, curr_entry when failed to realloc.
> 
> Fixes: eaafbad419bf ("cfgfile: library to interpret config files")
> 
> Signed-off-by: Dmitriy Yakovlev <bombermag@gmail.com>
> ---
>  lib/librte_cfgfile/rte_cfgfile.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 

Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

Re: [dpdk-dev] [PATCH] cfgfile: fix uninitialized variable on load error

[Thomas Monjalon]

> > Uninitialized scalar variable. Using uninitialized value cfg-
> > >sections[curr_section]->num_entries when calling rte_cfgfile_close.
> > And memory in variables cfg->sections[curr_section], sect-
> > >entries[curr_entry] maybe not equal NULL. We must decrement counters
> > curr_section, curr_entry when failed to realloc.
> > 
> > Fixes: eaafbad419bf ("cfgfile: library to interpret config files")
> > 
> > Signed-off-by: Dmitriy Yakovlev <bombermag@gmail.com>
> > ---
> >  lib/librte_cfgfile/rte_cfgfile.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> 
> Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

Applied, thanks