diff options
| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2021-04-21 21:31:46 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2021-08-27 16:01:27 +0200 |
| commit | 5eff88dd6b4badd664d7d3b648103d540b390248 (patch) | |
| tree | bb18c568b0ef5a82333fd21eace9655ff60ee668 /drivers/firmware | |
| parent | e73f0f0ee7541171d89f2e2491130c7771ba58d3 (diff) | |
efi: cper: fix scnprintf() use in cper_mem_err_location()
The last two if-clauses fail to update n, so whatever they might have
written at &msg[n] would be cut off by the final nul-termination.
That nul-termination is redundant; scnprintf(), just like snprintf(),
guarantees a nul-terminated output buffer, provided the buffer size is
positive.
And there's no need to discount one byte from the initial buffer;
vsnprintf() expects to be given the full buffer size - it's not going
to write the nul-terminator one beyond the given (buffer, size) pair.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/cper.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c index ea7ca74fc173..1cb70976dbe7 100644 --- a/drivers/firmware/efi/cper.c +++ b/drivers/firmware/efi/cper.c @@ -221,7 +221,7 @@ static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg) return 0; n = 0; - len = CPER_REC_LEN - 1; + len = CPER_REC_LEN; if (mem->validation_bits & CPER_MEM_VALID_NODE) n += scnprintf(msg + n, len - n, "node: %d ", mem->node); if (mem->validation_bits & CPER_MEM_VALID_CARD) @@ -258,13 +258,12 @@ static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg) n += scnprintf(msg + n, len - n, "responder_id: 0x%016llx ", mem->responder_id); if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID) - scnprintf(msg + n, len - n, "target_id: 0x%016llx ", - mem->target_id); + n += scnprintf(msg + n, len - n, "target_id: 0x%016llx ", + mem->target_id); if (mem->validation_bits & CPER_MEM_VALID_CHIP_ID) - scnprintf(msg + n, len - n, "chip_id: %d ", - mem->extended >> CPER_MEM_CHIP_ID_SHIFT); + n += scnprintf(msg + n, len - n, "chip_id: %d ", + mem->extended >> CPER_MEM_CHIP_ID_SHIFT); - msg[n] = '\0'; return n; } |