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authorBilly McFall <bmcfall@redhat.com>2017-02-15 11:39:12 -0500
committerDave Barach <openvpp@barachs.net>2017-02-22 16:23:12 +0000
commita9a20e7f69f4a91a4d5267ab5ce14125bdc7d6c6 (patch)
tree58647f28d51d1cac3e7aa4e9ca94280192e6ec25 /src/vlib/unix
parent2291a36008e197423a0f0414f6dcca4afa3ac4c1 (diff)
VPP-635: CLI Memory leak with invalid parameter
In the CLI parsing, below is a common pattern: /* Get a line of input. */ if (!unformat_user (input, unformat_line_input, line_input)) return 0; while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "x")) x = 1; : else return clib_error_return (0, "unknown input `%U'", format_unformat_error, line_input); } unformat_free (line_input); The 'else' returns if an unknown string is encountered. There a memory leak because the 'unformat_free(line_input)' is not called. There is a large number of instances of this pattern. Replaced the previous pattern with: /* Get a line of input. */ if (!unformat_user (input, unformat_line_input, line_input)) return 0; while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "x")) x = 1; : else { error = clib_error_return (0, "unknown input `%U'", format_unformat_error, line_input); goto done: } } /* ...Remaining code... */ done: unformat_free (line_input); return error; } In multiple files, 'unformat_free (line_input);' was never called, so there was a memory leak whether an invalid string was entered or not. Also, there were multiple instance where: error = clib_error_return (0, "unknown input `%U'", format_unformat_error, line_input); used 'input' as the last parameter instead of 'line_input'. The result is that output did not contain the substring in error, instead just an empty string. Fixed all of those as well. There are a lot of file, and very mind numbing work, so tried to keep it to a pattern to avoid mistakes. Change-Id: I8902f0c32a47dd7fb3bb3471a89818571702f1d2 Signed-off-by: Billy McFall <bmcfall@redhat.com> Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vlib/unix')
-rw-r--r--src/vlib/unix/cli.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/src/vlib/unix/cli.c b/src/vlib/unix/cli.c
index 69fca6ec7bc..88e2453cff2 100644
--- a/src/vlib/unix/cli.c
+++ b/src/vlib/unix/cli.c
@@ -2835,6 +2835,7 @@ unix_cli_set_terminal_pager (vlib_main_t * vm,
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
unformat_input_t _line_input, *line_input = &_line_input;
+ clib_error_t *error = 0;
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
@@ -2852,13 +2853,17 @@ unix_cli_set_terminal_pager (vlib_main_t * vm,
"Pager limit set to %u lines; note, this is global.\n",
um->cli_pager_buffer_limit);
else
- return clib_error_return (0, "unknown parameter: `%U`",
- format_unformat_error, line_input);
+ {
+ error = clib_error_return (0, "unknown parameter: `%U`",
+ format_unformat_error, line_input);
+ goto done;
+ }
}
+done:
unformat_free (line_input);
- return 0;
+ return error;
}
/*?
@@ -2886,6 +2891,7 @@ unix_cli_set_terminal_history (vlib_main_t * vm,
unix_cli_file_t *cf;
unformat_input_t _line_input, *line_input = &_line_input;
u32 limit;
+ clib_error_t *error = 0;
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
@@ -2901,8 +2907,11 @@ unix_cli_set_terminal_history (vlib_main_t * vm,
else if (unformat (line_input, "limit %u", &cf->history_limit))
;
else
- return clib_error_return (0, "unknown parameter: `%U`",
- format_unformat_error, line_input);
+ {
+ error = clib_error_return (0, "unknown parameter: `%U`",
+ format_unformat_error, line_input);
+ goto done;
+ }
/* If we reduced history size, or turned it off, purge the history */
limit = cf->has_history ? cf->history_limit : 0;
@@ -2914,9 +2923,10 @@ unix_cli_set_terminal_history (vlib_main_t * vm,
}
}
+done:
unformat_free (line_input);
- return 0;
+ return error;
}
/*?