From: Petr Štetiar Date: Sat, 3 Oct 2020 07:14:35 +0000 (+0200) Subject: file: uci_file_commit: fix memory leak X-Git-Url: http://git.openwrt.org/?a=commitdiff_plain;h=aa46546794acf5fb1f1f9bfb15152ea007e2c3c1;p=project%2Fuci.git file: uci_file_commit: fix memory leak Fixes following memory leak: 26 bytes in 1 blocks are definitely lost in loss record 1 of 1 at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) by 0x52DA68F: vasprintf (vasprintf.c:73) by 0x52B71D3: asprintf (asprintf.c:35) by 0x4E40F67: uci_file_commit (file.c:738) by 0x4E3FD94: uci_commit (libuci.c:193) by 0x401ED9: uci_do_import (cli.c:408) by 0x401ED9: uci_cmd (cli.c:685) by 0x4016FA: main (cli.c:776) Signed-off-by: Petr Štetiar --- diff --git a/file.c b/file.c index 23bf49a..5502a42 100644 --- a/file.c +++ b/file.c @@ -33,6 +33,10 @@ #include "uci.h" #include "uci_internal.h" +#ifndef MAX_PATH +#define MAX_PATH 4096 +#endif + #define LINEBUF 32 /* @@ -723,7 +727,7 @@ static void uci_file_commit(struct uci_context *ctx, struct uci_package **packag FILE *f1, *f2 = NULL; char *volatile name = NULL; char *volatile path = NULL; - char *filename = NULL; + char filename[MAX_PATH] = {0}; struct stat statbuf; volatile bool do_rename = false; int fd; @@ -735,7 +739,7 @@ static void uci_file_commit(struct uci_context *ctx, struct uci_package **packag UCI_THROW(ctx, UCI_ERR_INVAL); } - if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename) + if (snprintf(filename, MAX_PATH, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) UCI_THROW(ctx, UCI_ERR_MEM); /* open the config file for writing now, so that it is locked */ @@ -808,7 +812,6 @@ done: } free(path); } - free(filename); if (ctx->err) UCI_THROW(ctx, ctx->err); }