diff mbox series

bpf: Fix a erroneous check after snprintf()

Message ID 393bdebc87b22563c08ace094defa7160eb7a6c0.1694190795.git.christophe.jaillet@wanadoo.fr (mailing list archive)
State Accepted
Commit a8f12572860ad8ba659d96eee9cf09e181f6ebcc
Delegated to: BPF
Headers show
Series bpf: Fix a erroneous check after snprintf() | expand

Checks

Context Check Description
netdev/series_format warning Single patches do not need cover letters; Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1346 this patch: 1346
netdev/cc_maintainers success CCed 13 of 13 maintainers
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netdev/verify_fixes success Fixes tag looks correct
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 8 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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Commit Message

Christophe JAILLET Sept. 8, 2023, 4:33 p.m. UTC 
snprintf() does not return negative error code on error, it returns the
number of characters which *would* be generated for the given input.

Fix the error handling check.

Fixes: 57539b1c0ac2 ("bpf: Enable annotating trusted nested pointers")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 kernel/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

patchwork-bot+netdevbpf@kernel.org Sept. 12, 2023, 8:20 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri,  8 Sep 2023 18:33:35 +0200 you wrote:
> snprintf() does not return negative error code on error, it returns the
> number of characters which *would* be generated for the given input.
> 
> Fix the error handling check.
> 
> Fixes: 57539b1c0ac2 ("bpf: Enable annotating trusted nested pointers")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> 
> [...]

Here is the summary with links:
  - bpf: Fix a erroneous check after snprintf()
    https://git.kernel.org/bpf/bpf/c/a8f12572860a

You are awesome, thank you!
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 1095bbe29859..8090d7fb11ef 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -8501,7 +8501,7 @@  bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
 	tname = btf_name_by_offset(btf, walk_type->name_off);
 
 	ret = snprintf(safe_tname, sizeof(safe_tname), "%s%s", tname, suffix);
-	if (ret < 0)
+	if (ret >= sizeof(safe_tname))
 		return false;
 
 	safe_id = btf_find_by_name_kind(btf, safe_tname, BTF_INFO_KIND(walk_type->info));