From d207cf4c1ad27c6f8881857ca301f8489826116d Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Mon, 16 Dec 2013 11:45:01 +0100 Subject: [PATCH] bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller --- tools/net/bpf_exp.y | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/tools/net/bpf_exp.y b/tools/net/bpf_exp.y index f524110643bb..d15efc989ef5 100644 --- a/tools/net/bpf_exp.y +++ b/tools/net/bpf_exp.y @@ -40,8 +40,8 @@ extern void yyerror(const char *str); extern void bpf_asm_compile(FILE *fp, bool cstyle); static void bpf_set_curr_instr(uint16_t op, uint8_t jt, uint8_t jf, uint32_t k); -static void bpf_set_curr_label(const char *label); -static void bpf_set_jmp_label(const char *label, enum jmp_type type); +static void bpf_set_curr_label(char *label); +static void bpf_set_jmp_label(char *label, enum jmp_type type); %} @@ -573,7 +573,7 @@ txa static int curr_instr = 0; static struct sock_filter out[BPF_MAXINSNS]; -static const char **labels, **labels_jt, **labels_jf, **labels_k; +static char **labels, **labels_jt, **labels_jf, **labels_k; static void bpf_assert_max(void) { @@ -594,13 +594,13 @@ static void bpf_set_curr_instr(uint16_t code, uint8_t jt, uint8_t jf, curr_instr++; } -static void bpf_set_curr_label(const char *label) +static void bpf_set_curr_label(char *label) { bpf_assert_max(); - labels[curr_instr] = label; + labels[curr_instr] = label; } -static void bpf_set_jmp_label(const char *label, enum jmp_type type) +static void bpf_set_jmp_label(char *label, enum jmp_type type) { bpf_assert_max(); switch (type) { @@ -717,12 +717,25 @@ static void bpf_init(void) assert(labels_k); } +static void bpf_destroy_labels(void) +{ + int i; + + for (i = 0; i < curr_instr; i++) { + free(labels_jf[i]); + free(labels_jt[i]); + free(labels_k[i]); + free(labels[i]); + } +} + static void bpf_destroy(void) { - free(labels); + bpf_destroy_labels(); free(labels_jt); free(labels_jf); free(labels_k); + free(labels); } void bpf_asm_compile(FILE *fp, bool cstyle) -- 2.30.2