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regmap: debugfs: Ensure we don't underflow when printing access masks

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commit b763ec17ac upstream.

If a read is attempted which is smaller than the line length then we may
underflow the subtraction we're doing with the unsigned size_t type so
move some of the calculation to be additions on the right hand side
instead in order to avoid this.

Reported-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Brown
2015-09-19 07:00:18 -07:00
committed by Greg Kroah-Hartman
parent 4d2c033d84
commit 789ef3db34
1 changed files with 1 additions and 1 deletions
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2
drivers/base/regmap/regmap-debugfs.c
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@@ -419,7 +419,7 @@ static ssize_t regmap_access_read_file(struct file *file,
/* If we're in the region the user is trying to read */
if (p >= *ppos) {
/* ...but not beyond it */
if (buf_pos >= count - 1 - tot_len)
if (buf_pos + tot_len + 1 >= count)
break;
/* Format the register */