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authorQuentin Monnet <quentin@isovalent.com>2021-11-10 11:46:27 +0000
committerAndrii Nakryiko <andrii@kernel.org>2021-11-14 18:34:08 -0800
commitebbd7f64a3fbe9e0f235e39fc244ee9735e2a52a (patch)
tree7fba64ecd8cbaa7e268e53524433373ccd910197 /tools/bpf
parent325d956d67178af92b5b12ff950a2f93a433f2c4 (diff)
bpftool: Fix memory leak in prog_dump()
Following the extraction of prog_dump() from do_dump(), the struct btf allocated in prog_dump() is no longer freed on error; the struct bpf_prog_linfo is not freed at all. Make sure we release them before exiting the function. Fixes: ec2025095cf6 ("bpftool: Match several programs with same tag") Signed-off-by: Quentin Monnet <quentin@isovalent.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20211110114632.24537-2-quentin@isovalent.com
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/prog.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index bf85c914f2fa..e47e8b06cc3d 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -709,8 +709,8 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
char func_sig[1024];
unsigned char *buf;
__u32 member_len;
+ int fd, err = -1;
ssize_t n;
- int fd;
if (mode == DUMP_JITED) {
if (info->jited_prog_len == 0 || !info->jited_prog_insns) {
@@ -749,7 +749,7 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
if (fd < 0) {
p_err("can't open file %s: %s", filepath,
strerror(errno));
- return -1;
+ goto exit_free;
}
n = write(fd, buf, member_len);
@@ -757,7 +757,7 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
if (n != (ssize_t)member_len) {
p_err("error writing output file: %s",
n < 0 ? strerror(errno) : "short write");
- return -1;
+ goto exit_free;
}
if (json_output)
@@ -771,7 +771,7 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
info->netns_ino,
&disasm_opt);
if (!name)
- return -1;
+ goto exit_free;
}
if (info->nr_jited_func_lens && info->jited_func_lens) {
@@ -866,9 +866,12 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
kernel_syms_destroy(&dd);
}
- btf__free(btf);
+ err = 0;
- return 0;
+exit_free:
+ btf__free(btf);
+ bpf_prog_linfo__free(prog_linfo);
+ return err;
}
static int do_dump(int argc, char **argv)