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[BlueZ,v1,2/2] emulator: Fix Werror=stringop-overflow

Message ID 20250204164927.2839802-2-luiz.dentz@gmail.com
State New
Headers show
Series None | expand

Commit Message

Luiz Augusto von Dentz Feb. 4, 2025, 4:49 p.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This fixes the following build errors caused by buf being used as a
static from tracking progress of a packet when it is not necessary since
pkt_data exists for the same reason:

/usr/include/bits/unistd.h:32:10: error: ‘__read_alias’ specified size between 18446744073709490177 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Werror=stringop-overflow=]
   32 |   return __glibc_fortify (read, __nbytes, sizeof (char),
      |          ^~~~~~~~~~~~~~~
emulator/serial.c: In function ‘serial_read_callback’:
emulator/serial.c:78:24: note: destination object allocated here
   78 |         static uint8_t buf[4096];
      |                        ^~~
/usr/include/bits/unistd-decl.h:29:16: note: in a call to function ‘__read_alias’ declared with attribute ‘access (write_only, 2, 3)’
   29 | extern ssize_t __REDIRECT_FORTIFY (__read_alias, (int __fd, void *__buf,
      |                ^~~~~~~~~~~~~~~~~~

Fixes: https://github.com/bluez/bluez/issues/1049
---
 emulator/serial.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
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Patch

diff --git a/emulator/serial.c b/emulator/serial.c
index b74556b13547..f8062ae5eac3 100644
--- a/emulator/serial.c
+++ b/emulator/serial.c
@@ -75,7 +75,7 @@  static void serial_write_callback(const struct iovec *iov, int iovlen,
 static void serial_read_callback(int fd, uint32_t events, void *user_data)
 {
 	struct serial *serial = user_data;
-	static uint8_t buf[4096];
+	uint8_t buf[4096];
 	uint8_t *ptr = buf;
 	ssize_t len;
 	uint16_t count;
@@ -87,8 +87,7 @@  static void serial_read_callback(int fd, uint32_t events, void *user_data)
 	}
 
 again:
-	len = read(serial->fd, buf + serial->pkt_offset,
-			sizeof(buf) - serial->pkt_offset);
+	len = read(serial->fd, buf, sizeof(buf));
 	if (len < 0) {
 		if (errno == EAGAIN)
 			goto again;
@@ -98,7 +97,7 @@  again:
 	if (!serial->btdev)
 		return;
 
-	count = serial->pkt_offset + len;
+	count = len;
 
 	while (count > 0) {
 		hci_command_hdr *cmd_hdr;