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Code Issues Releases Activity

fftools/graph/graphprint: Fix races when initializing graphprint

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Setting print_graphs_format (in case no -print_graphs_format
option was specified) is racy, as is using av_strtok()
to split it. Both have been removed.

Notice that using av_strtok() was destructive: In the absence
of races the options would only have been applied for the
first initialization.

Reviewed-by: softworkz . <softworkz-at-hotmail.com@ffmpeg.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-05-30 16:02:08 +02:00
parent 6ede1e3fbf
commit 0742239289
2 changed files with 9 additions and 17 deletions
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19
fftools/graph/graphprint.c
View File

@ -874,8 +874,6 @@ static int init_graphprint(GraphPrintContext **pgpc, AVBPrint *target_buf)
AVTextFormatContext *tfc = NULL;
AVTextWriterContext *wctx = NULL;
GraphPrintContext *gpc = NULL;
char *w_args = NULL;
char *w_name;
int ret;
init_sections();
@ -883,19 +881,7 @@ static int init_graphprint(GraphPrintContext **pgpc, AVBPrint *target_buf)
av_bprint_init(target_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
if (!print_graphs_format)
print_graphs_format = av_strdup("json");
if (!print_graphs_format) {
ret = AVERROR(ENOMEM);
goto fail;
}
w_name = av_strtok(print_graphs_format, "=", &w_args);
if (!w_name) {
av_log(NULL, AV_LOG_ERROR, "No name specified for the filter graph output format\n");
ret = AVERROR(EINVAL);
goto fail;
}
const char *w_name = print_graphs_format ? print_graphs_format : "json";
text_formatter = avtext_get_formatter_by_name(w_name);
if (!text_formatter) {
@ -912,6 +898,9 @@ static int init_graphprint(GraphPrintContext **pgpc, AVBPrint *target_buf)
}
AVTextFormatOptions tf_options = { .show_optional_fields = -1 };
const char *w_args = print_graphs_format ? strchr(print_graphs_format, '=') : NULL;
if (w_args)
++w_args; // consume '='
ret = avtext_context_open(&tfc, text_formatter, wctx, w_args, sections, FF_ARRAY_ELEMS(sections), tf_options, NULL);
if (ret < 0) {
goto fail;

7
fftools/textformat/avtextformat.c
View File

@ -706,9 +706,12 @@ const AVTextFormatter *avtext_get_formatter_by_name(const char *name)
{
formatters_register_all();
for (int i = 0; registered_formatters[i]; i++)
if (!strcmp(registered_formatters[i]->name, name))
for (int i = 0; registered_formatters[i]; i++) {
const char *end;
if (av_strstart(name, registered_formatters[i]->name, &end) &&
(*end == '\0' || *end == '='))
return registered_formatters[i];
}
return NULL;
}