From 74bb9d5e63b0928ceac57fedd4a2d383129ade7d Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Tue, 27 Oct 2015 17:15:04 +0100 Subject: [PATCH] i2cdump: bail-out if block read fails We should bail-out if i2c_smbus_read_block_data() or i2c_smbus_read_i2c_block_data() return 0 or less. Add the missing check for the former and fix the existing for the latter. Signed-off-by: Bartosz Golaszewski Signed-off-by: Denys Vlasenko --- miscutils/i2c_tools.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/miscutils/i2c_tools.c b/miscutils/i2c_tools.c index 6d221e9fc..7be489036 100644 --- a/miscutils/i2c_tools.c +++ b/miscutils/i2c_tools.c @@ -724,16 +724,16 @@ static int read_block_data(int buf_fd, int mode, int *block) int res, blen = 0, tmp, i; if (mode == I2C_SMBUS_BLOCK_DATA) { - res = i2c_smbus_read_block_data(buf_fd, 0, cblock); - blen = res; + blen = i2c_smbus_read_block_data(buf_fd, 0, cblock); + if (blen <= 0) + goto fail; } else { for (res = 0; res < I2CDUMP_NUM_REGS; res += tmp) { tmp = i2c_smbus_read_i2c_block_data( buf_fd, res, I2C_SMBUS_BLOCK_MAX, cblock + res); - if (tmp < 0) { - bb_error_msg_and_die("block read failed"); - } + if (tmp <= 0) + goto fail; } if (res >= I2CDUMP_NUM_REGS) @@ -748,6 +748,9 @@ static int read_block_data(int buf_fd, int mode, int *block) } return blen; + + fail: + bb_error_msg_and_die("block read failed"); } /* Dump all but word data. */